@inproceedings{connor_mercer_stancil_booske_devetsikiotis_sullivan_gullie_klein_byrd_2023, title={Board 82: Remote, Hands-on ECE Teaching: Project RECET}, url={https://doi.org/10.18260/1-2--42962}, DOI={10.18260/1-2--42962}, abstractNote={: RECET (Remote Electrical and Computer Engineering Teaching) is a pilot project developed by the Electrical and Computer Engineering Department Heads Association (ECEDHA) to help provide quality ECE education even when fully online and explore issues associated with blended online and in-person instruction for the future. The COVID-19 pandemic forced most ECE programs in the US to rapidly go online. Departments found this transition quite challenging if they had not previously developed materials and infrastructure for online delivery. Online compatible techniques for teaching have been developed and researched for years, but prior to COVID-19 they were not widely deployed across ECE Departments in the US. The extraordinary push to online learning forced programs to look to experienced instructors at other academic institutions and educational hardware and software engineers in industry for help. ECEDHA and IEC offered online meetings to facilitate communication between faculty and teaching support staff from their member programs, but missing was a searchable, curated, content repository, especially for remote hands-on learning. Project RECET is working to fill this void by enabling active sharing of course content with other institutions and industry. RECET, while still a pilot, has passed through several revisions to improve the user experience. RECET visitors are greeted by a diagram that shows its basic structure as seen by content users or providers. Content is tagged by topic, course level and hardware and/or software platform. Content}, author={Connor, Kenneth and Mercer, Douglas and Stancil, Daniel and Booske, John and Devetsikiotis, Michael and Sullivan, Barry and Gullie, Kathy and Klein, Michelle and Byrd, Gregory}, year={2023}, month={Jun} }
 @article{stancil_byrd_2022, title={Principles of Superconducting Quantum Computers}, DOI={10.1002/9781119750758}, publisher={Wiley}, author={Stancil, Daniel D. and Byrd, Gregory T.}, year={2022}, month={Mar} }
 @article{ranu_stancil_2022, title={Single-magnon excited states of a Heisenberg spin chain using a quantum computer}, volume={106}, ISSN={["2469-9969"]}, url={https://doi.org/10.1103/PhysRevB.106.184402}, DOI={10.1103/PhysRevB.106.184402}, abstractNote={Excited states of spin-chains play an important role in condensed matter physics. We present a method of calculating the single magnon excited states of the Heisenberg spin-chain that can be efficiently implemented on a quantum processor for small spin chains. Our method involves finding the stationary points of the energy vs wavenumber curve. We implement our method for 4-site and 8-site Heisenberg Hamiltonians using numerical techniques as well as using an IBM quantum processor. Finally, we give an insight into the circuit complexity and scaling of our proposed method.}, number={18}, journal={PHYSICAL REVIEW B}, author={Ranu, Shashank Kumar and Stancil, Daniel D.}, year={2022}, month={Nov} }
 @book{stancil_prabhakar_2021, title={Spin Waves}, DOI={10.1007/978-3-030-68582-9}, publisher={Springer International Publishing}, author={Stancil, Daniel D. and Prabhakar, Anil}, year={2021} }
 @article{harris_stancil_ricketts_2019, title={Improved wireless power transfer efficiency with non-perfect lenses}, volume={114}, ISSN={["1077-3118"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85064392786&partnerID=MN8TOARS}, DOI={10.1063/1.5081629}, abstractNote={Negative refractive index metamaterials (MMs) have found widespread interest in shaping electromagnetic waves. One attractive area is energy transfer using low frequency magnetic waves or wireless power transfer (WPT). Previous reports have presented an isotropic metamaterial with μr = −1 as a “perfect lens” to focus energy and enhance WPT efficiency. In this work, we show that, while the perfect lens condition does enhance efficiency, anisotropic MMs with μr ≠ −1 can provide a larger enhancement in efficiency. These “non-perfect” lenses offer higher efficiency by enhancing the coupled field while incurring lower losses in the magnetostatic waves excited in or on the materials.}, number={14}, journal={APPLIED PHYSICS LETTERS}, author={Harris, William Carter and Stancil, Daniel D. and Ricketts, David S.}, year={2019}, month={Apr} }
 @article{stancil_balci yegen_dickey_gould_2017, title={Search for possible solar influences in Ra-226 decays}, volume={7}, ISSN={2211-3797}, url={http://dx.doi.org/10.1016/j.rinp.2016.12.051}, DOI={10.1016/j.rinp.2016.12.051}, abstractNote={Measurements of Ra-226 activity from eight HPGe gamma ray detectors at the NC State University PULSTAR Reactor were analyzed for evidence of periodic variations, with particular attention to annual variations. All measurements were made using the same reference source, and data sets were of varying length taken over the time period from September 1996 through August 2014. Clear evidence of annual variations was observed in data from four of the detectors. Short time periodograms from the data sets suggest temporal variability of both the amplitude and frequency of these variations. The annual variations in two of the data sets show peak values near the first of February, while surprisingly, the annual variations in the other two are roughly out of phase with the first two. Three of the four detectors exhibited annual variations over approximately the same time period. A joint statistic constructed by combining spectra from these three shows peaks approximating the frequencies of solar r-mode oscillations with νR = 11.74 cpy, m = 1, and l = 3, 5, 6. The fact that similar variations were not present in all detectors covering similar time periods rules out variations in activity as the cause, and points to differing sensitivities to unspecified environmental parameters instead. In addition to seasonal variations, the modulation of environmental parameters by solar processes remains a possible explanation of periodogram features, but without requiring new physics.}, journal={Results in Physics}, publisher={Elsevier BV}, author={Stancil, Daniel D. and Balci Yegen, Sümeyra and Dickey, David A. and Gould, Chris R.}, year={2017}, pages={385–406} }
 @article{cheng_casazza_grace_bai_stancil_2016, title={Channel Propagation Measurement and Modeling for Vehicular In-Cabin Wi-Fi Networks}, volume={64}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85027488942&partnerID=MN8TOARS}, DOI={10.1109/TAP.2016.2610190}, abstractNote={The next generation of intelligent vehicle systems will use wireless communication to connect a car and its passengers. It is therefore important to understand the in-cabin propagation characteristics of an automobile. This paper investigates the wireless channel native to these cabin enclosures. We present detailed, polarization dependent field measurements over a plane of interest in the cabin, and show that a simple analytical model gives reasonable agreement with our measurements.}, number={12}, journal={IEEE Transactions on Antennas and Propagation}, author={Cheng, L. and Casazza, J. and Grace, J. and Bai, F. and Stancil, D.D.}, year={2016}, pages={5424–5435} }
 @inproceedings{chabalko_harris_stancil_ricketts_2014, title={Experimental characterization of volume-mode waves in near-field anisotropic metamaterials with application to wireless power transfer}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84949100978&partnerID=MN8TOARS}, booktitle={2014 Asia-Pacific Microwave Conference Proceedings, APMC 2014}, author={Chabalko, M.J. and Harris, W.C. and Stancil, D.D. and Ricketts, D.S.}, year={2014}, pages={137–139} }
 @inproceedings{cheng_bai_daniel_2014, title={Radio channel in a minivan's passenger cabin: Preliminary ray tracing simulations}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84907862140&partnerID=MN8TOARS}, DOI={10.1109/APS.2014.6904629}, abstractNote={In-cabin wireless networks are attractive in that they enable the passengers to use their own personal equipment during road trips. It is therefore important to obtain information about the wave propagation in the vehicle cabin. This paper presents preliminary results of ray-tracing simulations of the in-vehicle radio channel. The simulations have been performed with respect to the passenger cabin of a Pontiac Montana (a minivan).}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Cheng, L. and Bai, F. and Daniel}, year={2014}, pages={597–598} }
 @article{warnick_daniel_sharma_fay_2014, title={The Remote Educational Antenna Laboratory: Making it Easier to Add Projects to Antenna Courses}, volume={56}, ISSN={["1558-4143"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84902004062&partnerID=MN8TOARS}, DOI={10.1109/map.2014.6821782}, abstractNote={An antenna measurement facility has been constructed that can be remotely controlled over the Internet. The primary purpose of the facility is to make it easier for instructors to include antenna construction and measurement projects in courses on antennas, RF systems, and electromagnetic fields. The facility is capable of measuring gain, patterns, and return loss for antennas of the type used in personal electronic devices in the 800 MHz to 6.5 GHz range. Experience with remotely supporting courses at Carnegie Mellon University, Georgia Institute of Technology, and Worcester Polytechnic Institute showed that both students and instructors felt that use of the remote laboratory added value to the students' experiences.}, number={1}, journal={IEEE ANTENNAS AND PROPAGATION MAGAZINE}, author={Warnick, K.F. and Daniel and Sharma, S.K. and Fay, A.L.}, year={2014}, month={Feb}, pages={211–220} }
 @article{arumugam_griffin_stancil_ricketts_2014, title={Three-Dimensional Position and Orientation Measurements Using Magneto-Quasistatic Fields and Complex Image Theory}, volume={56}, ISSN={["1558-4143"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84901979580&partnerID=MN8TOARS}, DOI={10.1109/map.2014.6821771}, abstractNote={Traditional wireless position-location systems, operating using propagating waves, suffer reduced performance in non-line-of-sight (NLoS) applications. Traditional systems that use quasistatic fields have instead been limited to short ranges, progressive direction-finding applications, require RF fingerprinting, or do not provide complete immunity to dielectric obstacles (use of electric fields). These limitations impose severe restrictions in applications such as tracking an American football during game play, where position and orientation tracking may be required over long ranges, and when the line-of-sight (LoS) is blocked by groups of people. A technique using magneto-quasistatic fields and complex image theory was recently shown to circumvent these problems, and to enable accurate long-range one-dimensional and two-dimensional measurements. In this work, we present three-dimensional position and orientation measurements using the magneto-quasistatic system and complex image theory over an area of 27.43 m × 27.43 m. Inverting the theoretical expression for the voltage measured at the terminals of the receiving loops to determine three-dimensional position and orientation resulted in mean and median geometric position errors of 0.77 m and 0.71 m, respectively; inclination orientation mean and median errors of 9.67° and 8.24°, respectively; and azimuthal orientation mean and median errors of 2.84° and 2.25°, respectively.}, number={1}, journal={IEEE ANTENNAS AND PROPAGATION MAGAZINE}, author={Arumugam, Darmindra D. and Griffin, Joshua D. and Stancil, Daniel D. and Ricketts, David S.}, year={2014}, month={Feb}, pages={160–173} }
 @article{cheng_stancil_bai_2013, title={A Roadside Scattering Model for the Vehicle-to-Vehicle Communication Channel}, volume={31}, ISSN={["1558-0008"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84883458078&partnerID=MN8TOARS}, DOI={10.1109/jsac.2013.sup.0513040}, abstractNote={Achieving accurate and effective modeling of the vehicle-to-vehicle (V2V) communication channel has proven to be a challenging task, particularly owing to the highly dynamic nature of vehicular environments. V2V channels generally may have contributions from the line-of-sight path, reflections from large stationary and moving objects such as bridges and other vehicles, and a diffuse base from large numbers of small stationary objects in the environment. We propose a new geometrical model for the diffuse component based on scattering objects distributed along the roadside, and use this model to predict the Doppler spectrum and angle-of-arrival distribution associated with this component for various V2V scenarios. In contrast with previous roadside scattering models that sum the contributions from large numbers of randomly-generated scattering objects, our model assumes a uniform linear distribution along the roadside. This permits a computationally efficient, closed-form model. Comparisons with on-road measurement data as well as the double ring model demonstrate the validity and effectiveness of the proposed model.}, number={9}, journal={IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS}, author={Cheng, Lin and Stancil, Daniel D. and Bai, Fan}, year={2013}, month={Sep}, pages={449–459} }
 @inproceedings{downey_paramesh_stancil_mukherjee_2013, title={A stepped-frequency continuous wave ranger for aiding pedestrian navigation}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84876012098&partnerID=MN8TOARS}, DOI={10.1109/WiSNet.2013.6488623}, abstractNote={Pedestrian navigation is readily enabled by GPS in outdoor environments. However, there are many locations - indoors, urban canyons and underground - where the GPS signal is unreliable or unavailable. Compact, MEMS inertial navigation, augmented by a Shoe Ranging Sensor (SRS) that measures scalar range between shoes, greatly reduces navigational error over large distances in simulations. Existing sensors have insufficient measurement dynamic range or environmental resiliency. Here, the authors report on an SRS based on stepped-frequency continuous wave radar with RMS ranging accuracy of 0.59 mm and 1 m range. This is an order-of-magnitude more accuracy over recent ultra-wideband rangers.}, booktitle={WiSNet 2013 - Proceedings: 2013 IEEE Topical Conference on Wireless Sensors and Sensor Networks - 2013 IEEE Radio and Wireless Week, RWW 2013}, author={Downey, J. and Paramesh, J. and Stancil, D. and Mukherjee, T.}, year={2013}, pages={28–30} }
 @inproceedings{arumugam_sibley_griffin_stancil_ricketts_2013, title={An active position sensing tag for sports visualization in American football}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84881340615&partnerID=MN8TOARS}, DOI={10.1109/RFID.2013.6548141}, abstractNote={Remote experience and visualization in sporting events can be significantly improved by providing accurate tracking information of the players and objects in the event. Sporting events such as American football or rugby have proved difficult for camera- and radio-based tracking due to blockage of the line-of-sight, or proximity of the ball to groups of players. Magnetoquasistatic fields have been shown to enable accurate position and orientation sensing in these environments [1]-[3]. In this work, we introduce a magnetoquasistatic tag developed for tracking an American football during game-play. We describe its integration into an American football and demonstrate its use in game-play during a collegiate American football practice.}, booktitle={2013 IEEE International Conference on RFID, RFID 2013}, author={Arumugam, D.D. and Sibley, M. and Griffin, J.D. and Stancil, D.D. and Ricketts, D.S.}, year={2013}, pages={96–103} }
 @article{arumugam_griffin_stancil_ricketts_2013, title={Magneto-quasistatic tracking of an American football: A goal-line measurement}, volume={55}, number={1}, journal={IEEE Antennas and Propagation Magazine}, author={Arumugam, D. D. and Griffin, J. D. and Stancil, D. D. and Ricketts, D. S.}, year={2013}, pages={137–146} }
 @article{arumugam_griffin_stancil_ricketts_2013, title={Magneto-quasistatic tracking of an American football: A goal-line measurement [measurements corner]}, volume={55}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84874844969&partnerID=MN8TOARS}, DOI={10.1109/MAP.2013.6474504}, abstractNote={An American football was tracked using a long-range magneto-quasistatic position and orientation measurement system. A low-weight emitter that emitted a low-frequency quasistatic magnetic field was embedded within an American football. The emitter weighed a total of 26.5 g, which was within the manufacturing tolerance of an American football, and did not alter the dynamics of the ball. Measurements of a person carrying the football along the goal line of an American football field are described, along with a description of the construction of the magneto-quasistatic tracking system. The technique demonstrated measurements with a distance accuracy of 15 cm and an azimuthal orientation accuracy of 2.45° for measurements conducted along the goal line of an American football field.}, number={1}, journal={IEEE Antennas and Propagation Magazine}, author={Arumugam, D.D. and Griffin, J.D. and Stancil, D.D. and Ricketts, D.S.}, year={2013}, pages={137–146} }
 @article{bai_hartenstein_gruteser_kravets_zhang_stancil_2013, title={Special Section on Vehicular Networks and Communication Systems: From Laboratory into Reality}, volume={62}, ISSN={["1939-9359"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84888111231&partnerID=MN8TOARS}, DOI={10.1109/tvt.2013.2286434}, abstractNote={This special section includes nine technical papers that mainly deal with vehicular wireless networks, covering a rich variety of research topics ranging from vehicular channel modeling to safety application design.}, number={9}, journal={IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY}, author={Bai, Fan and Hartenstein, Hannes and Gruteser, Marco and Kravets, Robin and Zhang, Tao and Stancil, Daniel D.}, year={2013}, month={Nov}, pages={4146–4149} }
 @article{stancil_2012, title={Active negative inductor based on magnetic flux}, volume={32}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84867155570&partnerID=MN8TOARS}, journal={Progress In Electromagnetics Research C}, author={Stancil, D.D.}, year={2012}, pages={259–269} }
 @article{stancil_adamson_alania_aliaga_andrews_del castillo_bagby_bazo alba_bodek_boehnlein_et al._2012, title={Demonstration of communication using neutrinos}, volume={27}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84859365414&partnerID=MN8TOARS}, DOI={10.1142/S0217732312500770}, abstractNote={ Beams of neutrinos have been proposed as a vehicle for communications under unusual circumstances, such as direct point-to-point global communication, communication with submarines, secure communications and interstellar communication. We report on the performance of a low-rate communications link established using the NuMI beam line and the MINERvA detector at Fermilab. The link achieved a decoded data rate of 0.1 bits/sec with a bit error rate of 1% over a distance of 1.035 km, including 240 m of earth. }, number={12}, journal={Modern Physics Letters A}, author={Stancil, D.D. and Adamson, P. and Alania, M. and Aliaga, L. and Andrews, M. and Del Castillo, C.A. and Bagby, L. and Bazo Alba, J.L. and Bodek, A. and Boehnlein, D. and et al.}, year={2012} }
 @article{stancil_adamson_alania_aliaga_andrews_del castillo_bagby_alba_bodek_boehnlein_et al._2012, title={Demonstration of communication using neutrinos}, volume={27}, number={12}, journal={Modern Physics Letters A}, author={Stancil, D. D. and Adamson, P. and Alania, M. and Aliaga, L. and Andrews, M. and Del Castillo, C. A. and Bagby, L. and Alba, J. L. B. and Bodek, A. and Boehnlein, D. and et al.}, year={2012} }
 @article{arumugam_griffin_stancil_ricketts_2012, title={Error Reduction in Magnetoquasistatic Positioning Using Orthogonal Emitter Measurements}, volume={11}, ISSN={["1536-1225"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84871829678&partnerID=MN8TOARS}, DOI={10.1109/lawp.2012.2229958}, abstractNote={Measurements of the emitted magnetoquasistatic fields generated by a vertical emitting loop and detected at the terminals of seven fixed vertical receiving loops, all located above earth, are used to solve for position and orientation of the emitter. The coupling between the mobile emitting and fixed receiving loops was measured over a 3 × 3 emitter grid spanning an 18 ×18-m <sup>2</sup> area and for azimuthal orientations between 0<sup>°</sup> and 330<sup>°</sup> at 30<sup>°</sup> increments. Inverting the theoretical coupling expressions for two-dimensional position and azimuthal orientation resulted in a mean position and orientation error of 0.62 m and 2.86<sup>°</sup>, respectively. Calculations including orthogonal-emitter configurations resulted in a mean position and orientation error of 0.21 m and 1.12<sup>°</sup> , respectively, which represents a 66.1% and 60.8% reduction in error, respectively.}, journal={IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS}, author={Arumugam, Darmindra D. and Griffin, Joshua D. and Stancil, Daniel D. and Ricketts, David S.}, year={2012}, pages={1462–1465} }
 @inproceedings{arumugam_griffin_stancil_ricketts_2012, title={Experimental study on the effects of groups of people on magnetoquasistatic positioning accuracy}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84870566632&partnerID=MN8TOARS}, DOI={10.1109/APS.2012.6349385}, abstractNote={Position and orientation measurements have been demonstrated, recently, using low-frequency magnetoquasistatic fields and complex image theory for distances up to 50 m [1]. The key motivation for using magnetoquasistatic fields is to enable accurate estimation of an object's position and orientation when near weakly conducting dielectric obstacles, e.g., groups of people. An example application is tracking an American football during game-play [1]. In this paper, we present measurements using the magnetoquasistatic technique to show that the presence of a large group of 25 people introduces a peak distance error of less than 4.5 cm for an emitter-receiver distance of 10 m.}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Arumugam, D.D. and Griffin, J.D. and Stancil, D.D. and Ricketts, D.S.}, year={2012} }
 @article{fernandez_borries_cheng_kumar_stancil_bai_2012, title={Performance of the 802.11p Physical Layer in Vehicle-to-Vehicle Environments}, volume={61}, ISSN={["1939-9359"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84856196012&partnerID=MN8TOARS}, DOI={10.1109/tvt.2011.2164428}, abstractNote={A reliable robust wireless network of connected vehicles is desired to enable a number of future telematics and infotainment applications in the vehicular domain. To achieve this objective, vehicle-to-vehicle (V2V) communication is standardized by the IEEE 802.11p Dedicated Short Range Communications (DSRC) standard. Providing reliable communication performance in a highly dynamic time-varying V2V channel is a challenging task. To tackle this challenge, we propose a dynamic equalization scheme, on top of the existing DSRC technology, that significantly improves the packet error rate (PER) of data transmissions without changing the DSRC standard. We also show a hardware implementation of this scheme based on a field-programmable gate array (FPGA) to demonstrate its implementation feasibility. Furthermore, we extend our improved equalization scheme to various data rate options available in the DSRC standard, showing that the proposed scheme is sufficiently generic to support different types of V2V communication. Finally, we report the results of investigating the dependence of wireless communication performance (in terms of PER and throughput) on various design parameters such as packet length, payload size, and data rate.}, number={1}, journal={IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY}, author={Fernandez, Joseph A. and Borries, Kevin and Cheng, Lin and Kumar, B. V. K. Vijaya and Stancil, Daniel D. and Bai, Fan}, year={2012}, month={Jan}, pages={3–14} }
 @inproceedings{arumugam_griffin_stancil_ricketts_2012, title={Wireless orientation sensing using magnetoquasistatic fields and complex image theory}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84860659293&partnerID=MN8TOARS}, DOI={10.1109/RWS.2012.6175362}, abstractNote={In this paper we report on a magnetoquasistatic orientation sensor that uses the magnetoquasistatic coupling between an electrically small emitting loop (magnetic dipole) and seven vertical receiving loops located on a circle of radius 12.19 m to determine the orientation of an object. By inverting the theoretical expression for the coupling between the emitter and receivers and using complex image theory, we are able to estimate the azimuthal orientation, φ, and inclination orientation, θ, of the emitter from the received fields. We achieved an average error of 5.93° and 10.66°, respectively, and a median error of 4.08° and 8.68°, respectively.}, booktitle={RWW 2012 - Proceedings: IEEE Radio and Wireless Symposium, RWS 2012}, author={Arumugam, D.D. and Griffin, J.D. and Stancil, D.D. and Ricketts, D.S.}, year={2012}, pages={251–254} }
 @inproceedings{zhou_downey_stancil_mukherjee_2011, title={A shoe to shoe RF ranging sensor for aiding inertial navigation}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-83755168189&partnerID=MN8TOARS}, DOI={10.1109/VETECF.2011.6093290}, abstractNote={An RF ranging sensor based on time-interleaved Dual Frequency Continuous Wave (DFCW) radar is proposed to measure the absolute distance between two shoes to aid a dead reckoning system for pedestrian navigation. Conventional single frequency Continuous Wave (CW) radar provides accurate but ambiguous range measurement, while DFCW techniques are employed to find the approximate range of the target and to remove the ambiguity of the single frequency CW radar. The two frequencies in the proposed DFCW radar work in a Time-division Duplexing (TDD) manner so that they can share the same transceiver hardware. Such a composite DFCW/CW system can be implemented with a simple direct conversion receiver which is desirable for applications such as pedestrian navigation where compact and low power consumption devices are required. The feasibility of the proposed sensor is demonstrated by a sensor prototype based on Commercial Off The Shelf (COTS) components in a practical environment. An absolute accuracy (RMS) of 0.92 mm has been achieved for a maximum test range of 600 mm. The results show that the proposed ranging sensor is promising for measuring the distance in short range applications.}, booktitle={IEEE Vehicular Technology Conference}, author={Zhou, C. and Downey, J. and Stancil, D. and Mukherjee, T.}, year={2011} }
 @article{zhou_downey_choi_stancil_paramesh_mukherjee_2011, title={A shoe-embedded RF sensor for motion detection}, volume={21}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-79952705701&partnerID=MN8TOARS}, DOI={10.1109/LMWC.2010.2103052}, abstractNote={Inertial Measurement Unit (IMU) based pedestrian navigation systems suffer from long term inaccuracy due to sensor bias drift. Zero velocity update (ZUPT) algorithms can estimate the drift and improve the system accuracy. Accurate zero velocity period detection is critical for the performance of ZUPT algorithms. A low power shoe-embedded RF sensor is proposed to identify zero velocity periods of a foot when a person is walking. This letter reports the hardware system development and the performance characterizations. The results show that the sensor can detect relative position changes with an accuracy of better than 1.3 mm and a velocity as low as 191 μm/s. The developed miniature sensor was embedded into the heel, and zero velocity periods were successfully detected during walking tests.}, number={3}, journal={IEEE Microwave and Wireless Components Letters}, author={Zhou, C. and Downey, J. and Choi, J. and Stancil, D. and Paramesh, J. and Mukherjee, T.}, year={2011}, pages={169–171} }
 @inproceedings{nikitin_stancil_erosheva_2011, title={Estimating the number of modes in multimode waveguide propagation environment}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-80055004102&partnerID=MN8TOARS}, DOI={10.1109/APS.2011.5996623}, abstractNote={In this paper, we estimate the number of propagating modes in rectangular and circular multimode waveguides and express it as a closed-form function of excitation frequency and waveguide cross-sectional dimensions. The presented formulas can be used to quickly estimate the number of modes which can propagate in multimode waveguide communication channels such as pipes, ducts, and tunnels.}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Nikitin, P.V. and Stancil, D.D. and Erosheva, E.A.}, year={2011}, pages={1662–1665} }
 @article{arumugam_griffin_stancil_2011, title={Experimental Demonstration of Complex Image Theory and Application to Position Measurement}, volume={10}, ISSN={["1536-1225"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-79955438789&partnerID=MN8TOARS}, DOI={10.1109/lawp.2011.2136370}, abstractNote={Measurements of the magnetoquasistatic fields generated from a magnetic dipole (an electrically small current loop) located above the Earth are presented and compared to calculations using complex image theory. With a horizontal (i.e., the surface normal parallel to the Earth) emitting loop located at a height of h and a copolarized horizontal receiving loop located at a height of z ≥ 0, coupling between the dipoles was measured for distances up to 50 m along a direction perpendicular to the surface normal axes of the loops. Inverting the theoretical expressions to estimate the distance from measured field values resulted in peak and rms distance estimation errors of 23.01 and 11.74 cm, respectively, for distances between 1.3 and 34.2 m. Received signals were not strongly affected by the proximity of a group of people even when the line of sight was obstructed.}, journal={IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS}, author={Arumugam, Darmindra D. and Griffin, Joshua D. and Stancil, Daniel D.}, year={2011}, pages={282–285} }
 @inproceedings{arumugam_griffin_stancil_ricketts_2011, title={Higher order loop corrections for short range magnetoquasistatic position tracking}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-80054986487&partnerID=MN8TOARS}, DOI={10.1109/APS.2011.5996833}, abstractNote={Magnetoquasistatic position tracking has been shown to be an excellent technique to measure distances between an emitting and receiving loop for distances up to 50 m along a direction perpendicular to the surface normal of the loops [1]. For short distances from the emitting loop (i.e., less than about ten loop radii) there is an error in the estimated distance. In this paper, we examine the cause of this error and show that a significant portion is due to the simplification of the emitting loop as a simple magnetic dipole. By including a more accurate expression of the source field, errors can be significantly reduced. We show that the first correction term results in a reduction in rms and peak distance estimation error of 12.51 cm (54.44 %) and 11.27 cm (44.72 %), respectively, for distances less than 1.5δ, where δ is the skin depth.}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Arumugam, D. and Griffin, J. and Stancil, D. and Ricketts, D.}, year={2011}, pages={1755–1757} }
 @inproceedings{arumugam_stancil_ricketts_2011, title={Proximity and orientation sensing using magnetoquasistatic fields and complex image theory}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-83755170795&partnerID=MN8TOARS}, DOI={10.1109/VETECF.2011.6093266}, abstractNote={A sensing technique to determine the height and orientation (pitch, roll) above a conducting half-space using magnetoquasistatic fields and complex image theory is presented. The technique is based on measuring the fields due to the complex image of a magnetic dipole source at different locations. Examples for use of this sensor include applications as diverse as aerial vehicle landing, take-off and hovering, terrain-relative navigation, and motion sensing or tracking.}, booktitle={IEEE Vehicular Technology Conference}, author={Arumugam, D.D. and Stancil, D.D. and Ricketts, D.S.}, year={2011} }
 @article{jin_moura_jiang_stancil_cepni_2011, title={Time reversal detection in clutter: Additional experimental results}, volume={47}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-79551639073&partnerID=MN8TOARS}, DOI={10.1109/TAES.2011.5705665}, abstractNote={Time reversal (TR) is a promising technique in detecting weak targets immersed in clutter. This paper reports a series of electromagnetic (EM) domain experiments on TR detection using a single antenna pair in a controlled scattering environment. The TR likelihood ratio detector is compared with the conventional energy detector and the matched filter. The EM experiments demonstrate the superiority of TR detection over conventional detection in rich multipath scattering environments.}, number={1}, journal={IEEE Transactions on Aerospace and Electronic Systems}, author={Jin, Y. and Moura, J.M.F. and Jiang, Y. and Stancil, D.D. and Cepni, A.G.}, year={2011}, pages={140–154} }
 @inproceedings{chabalko_schlesinger_stancil_luo_bain_2011, title={Trans-ABS power coupling efficiency of near field transducers for HAMR calculated with finite element modeling}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84912057369&partnerID=MN8TOARS}, booktitle={Optics InfoBase Conference Papers}, author={Chabalko, M. and Schlesinger, T.E. and Stancil, D. and Luo, Y. and Bain, J.A.}, year={2011} }
 @inproceedings{arumugam_griffin_stancil_ricketts_2011, title={Two-dimensional position measurement using magnetoquasistatic fields}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-80155140346&partnerID=MN8TOARS}, DOI={10.1109/APWC.2011.6046832}, abstractNote={Two-dimensional (2-D) measurements of the magnetoquasistatic fields generated from a magnetic dipole (an electrically small current loop) located above the earth are compared to calculations using complex image theory. The magnetoquasistatic coupling between a vertical (i.e., surface normal parallel to the earth) emitting loop and seven vertical receiving loops was measured in a two-dimensional x−y grid of 27.43 m by 27.43 m, all above the earth, where the receiving loops were located outside this grid. Inverting the theoretical expressions to estimate two-dimensional position from measured field values resulted in an average geometric position error of 1.08 m (100th percentile of the measured grid), and an average error of 0.89 m for 95th percentile of measured grid.}, booktitle={Proceedings - 2011 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, APWC'11}, author={Arumugam, D.D. and Griffin, J.D. and Stancil, D.D. and Ricketts, D.S.}, year={2011}, pages={1193–1196} }
 @article{zhou_downey_stancil_mukherjee_2010, title={A low-power shoe-embedded radar for aiding pedestrian inertial navigation}, volume={58}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-77958007826&partnerID=MN8TOARS}, DOI={10.1109/TMTT.2010.2063810}, abstractNote={Navigation in global positioning system (GPS)-denied or GPS-inhibited environments such as urban canyons, mountain areas, and indoors is often accomplished with an inertial measurement unit (IMU). For portable navigation, miniaturized IMUs suffer from poor accuracy due to bias, bias drift, and noise. We propose to use a low-power shoe-embedded radar as an aiding sensor to identify zero velocity periods during which the individual IMU sensor biases can be observed. The proposed radar sensor can also be used to detect the vertical position and velocity of the IMU relative to the ground in real time, which provides additional independent information for sensor fusion. The impacts of the noise and interference on the system performance have been analyzed analytically. A prototype sensor has been constructed to demonstrate the concept, and experimental results show that the proposed sensor is promising for position and velocity sensing.}, number={10}, journal={IEEE Transactions on Microwave Theory and Techniques}, author={Zhou, C. and Downey, J. and Stancil, D. and Mukherjee, T.}, year={2010}, pages={2521–2528} }
 @book{stancil_bai_cheng_2010, title={Communication Systems for Car-2-X Networks}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84886202089&partnerID=MN8TOARS}, DOI={10.1002/9780470661314.ch3}, abstractNote={This chapter provides an overview of the architectures and environments for Vehicle-to-Infrastructure (V2I) and Vehicle-to-Vehicle (V2V) communication. Antenna requirements and channel properties are discussed with an emphasis on the car-to-car environment. The impact of channel properties on Orthogonal Frequency Division Multiplexing (OFDM) is discussed together with its implications and recommendations for the IEEE 802.11p standard. The protocol requirements for Dedicated Short Range Communications (DSRC) applications differ substantially from those of conventional wireless networks. The chapter discusses the use of multiple channels for medium access, as well as broadcast and unicast protocols. Single-hop and multi-hop protocols are discussed, including techniques for enhancing the reliability for safety-critical applications. Next, the technical portion ends with a discussion of network layer challenges related to mobility, such as mobile IP and dynamic address allocation schemes. The chapter concludes with a discussion of future directions and challenges. Controlled Vocabulary Terms communication systems; OFDM; vehicular ad hoc networks}, journal={Vehicular Networking: Automotive Applications and Beyond}, author={Stancil, D.D. and Bai, F. and Cheng, L.}, year={2010}, pages={45–81} }
 @inproceedings{fernandez_stancil_bai_2010, title={Dynamic channel equalization for IEEE 802.11p waveforms in the vehicle-to-vehicle channel}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-79952419235&partnerID=MN8TOARS}, DOI={10.1109/ALLERTON.2010.5706954}, abstractNote={The IEEE 802.11p standard (or Dedicated Short Range Communication, DSRC) [1] has been proposed to be the standard for vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communications. Since the IEEE 802.11a-based DSRC standard is not fully customized for outdoor, highly mobile channels, the performance of DSRC standard might degrade in a challenging V2V channel. In this paper, we develop several equalization schemes that are able to closely track the V2V channel dynamics and thus improve performance at the physical layer. Through a set of empirical experiments, we show that the performance (in terms of Packet Error Rate) can be significantly improved from 41% (using a simple Least Square Estimator) to 19% (using a Spectral Temporal Averaging Estimator).}, booktitle={2010 48th Annual Allerton Conference on Communication, Control, and Computing, Allerton 2010}, author={Fernandez, J.A. and Stancil, D.D. and Bai, F.}, year={2010}, pages={542–551} }
 @inproceedings{borries_wang_judd_steenkiste_stancil_2010, title={EXperience with a wireless network testbed based on signal propagation emulation}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-77954441199&partnerID=MN8TOARS}, DOI={10.1109/EW.2010.5483538}, abstractNote={The evaluation of wireless research is challenging because signals traveling through the ether are affected by the physical environment, including movement by people and objects. As a result, testbed experiments are hard to control and are non-repeatable. We have developed a wireless networking testbed based on digital signal propagation emulation that provides control over the signal propagation environment. The testbed has been in regular use for research and education since early 2007. In this paper we present measurements illustrating the properties of the emulator testbed. We also compare the results of various experiments on the emulator with simulation results to shed some light on when the increased accuracy of the emulator testbed is important. Finally, we use the experience gained on the emulator to identify classes of experiments for which the emulator is well suited, compared with other evaluation platforms.}, booktitle={2010 European Wireless Conference, EW 2010}, author={Borries, K. and Wang, X. and Judd, G. and Steenkiste, P. and Stancil, D.}, year={2010}, pages={833–840} }
 @article{nikitin_arumugam_chabalko_henty_stancil_2010, title={Long Range Passive UHF RFID System Using HVAC Ducts}, volume={98}, ISSN={["0018-9219"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-77956063007&partnerID=MN8TOARS}, DOI={10.1109/jproc.2010.2047821}, abstractNote={In this paper, the use of hollow metal heating, ventilating, and air-conditioning (HVAC) ducts as a potential communication channel between passive ultrahigh-frequency (UHF) radio-frequency identification (RFID) readers and tags is studied. HVAC ducts behave as electromagnetic waveguides with much lower signal attenuation compared to free-space propagation. This low-loss electromagnetic environment allows one to greatly increase the communication range of passive UHF RFID systems and build, for example, a long range passive sensor network spanning an entire infrastructure such as a large building. In this work, it is shown both theoretically and experimentally that the read range of passive UHF RFID systems can be increased by multiple times compared to operation in a free-space environment.}, number={9}, journal={PROCEEDINGS OF THE IEEE}, author={Nikitin, Pavel V. and Arumugam, Darmindra D. and Chabalko, Matthew J. and Henty, Benjamin E. and Stancil, Daniel D.}, year={2010}, month={Sep}, pages={1629–1635} }
 @inproceedings{bai_stancil_krishnan_2010, title={Toward understanding characteristics of Dedicated Short Range Communications (DSRC) from a perspective of vehicular network engineers}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-78649279855&partnerID=MN8TOARS}, DOI={10.1145/1859995.1860033}, abstractNote={IEEE 802.11p-based Dedicated Short Range Communications (DSRC) is considered a promising wireless technology for enhancing transportation safety and improving highway efficiency. Here, using a large set of empirical measurement data taken in a rich variety of realistic driving environments, we attempt to characterize communication properties of DSRC as well as to analyze the causes of communication loss. Specifically, from a perspective of vehicular network engineers, the fundamental characteristic of DSRC communications is Packet Delivery Ratio (PDR). We investigate the impact of both uncontrollable environmental factors and controllable radio parameters on DSRC characteristics. Moreover, we also examine temporal correlation, spatial correlation and symmetric correlation of DSRC characteristics under realistic vehicular environments.}, booktitle={Proceedings of the Annual International Conference on Mobile Computing and Networking, MOBICOM}, author={Bai, F. and Stancil, D.D. and Krishnan, H.}, year={2010}, pages={329–340} }
 @inproceedings{zhou_downey_stancil_mukherjee_2009, title={A compact positioning and velocity RF sensor for improved inertial navigation}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-77949967554&partnerID=MN8TOARS}, DOI={10.1109/MWSYM.2009.5165973}, abstractNote={Navigation in GPS-denied or GPS-inhibited environments such as urban canyons, mountain areas, and indoors is often accomplished with an Inertial Measurement Unit (IMU). For portable navigation, minaturized IMUs suffer from poor accuracy due to bias, bias drift and noise. We propose to use a compact RF motion sensor to identify zero velocity periods during which the individual IMU sensor biases can be observed. The proposed motion sensor can also be used to detect the position and velocity of the IMU relative to the ground in real time, which provides additional independent information for sensor fusion. A prototype RF motion sensor has been constructed to demonstrate the concept and experimental results show that the proposed RF motion sensor is promising in position and velocity sensing.}, booktitle={IEEE MTT-S International Microwave Symposium Digest}, author={Zhou, C. and Downey, J. and Stancil, D. and Mukherjee, T.}, year={2009}, pages={1421–1424} }
 @inproceedings{cheng_bai_stancil_2009, title={A new geometrical channel model for vehicle-to-vehicle communications}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-71049179330&partnerID=MN8TOARS}, DOI={10.1109/APS.2009.5171920}, abstractNote={We have presented a new analytical model of the Doppler spectrum in the V2V environment based on scattering objects distributed along both sides of the roadway. Comparisons with examples of measured spectra from the suburban environment show improved agreement with the shape of the spectra compared to the double-ring model. We believe the new model could be beneficial for both wireless emulators and network applications. For example, the model would improve the accuracy of wireless emulators, in turn making more accurate hardware performance evaluations (such as BER) possible. Similarly, an accurate physical level channel model allows the evaluation of different MAC protocols under realistic conditions.}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Cheng, L. and Bai, F. and Stancil, D.D.}, year={2009} }
 @article{goldstein_mowry_campbell_ashley-rollman_de rosa_funiak_hoburg_karagozler_kirby_lee_et al._2009, title={Beyond audio and video: Using claytronics to enable pario}, volume={30}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-78649549845&partnerID=MN8TOARS}, number={2}, journal={AI Magazine}, author={Goldstein, S.C. and Mowry, T.C. and Campbell, J.D. and Ashley-Rollman, M.P. and De Rosa, M. and Funiak, S. and Hoburg, J.F. and Karagozler, M.E. and Kirby, B. and Lee, P. and et al.}, year={2009}, pages={29–45} }
 @inproceedings{borries_judd_stancil_steenkiste_2009, title={FPGA-based channel simulator for a wireless network emulator}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-70349690440&partnerID=MN8TOARS}, DOI={10.1109/VETECS.2009.5073565}, abstractNote={Wireless channel emulators are important tools for testing radio devices, especially in mobile environments. Wireless network emulators give the same accuracy and control for testing radio network systems that traditional channel emulators give to point to point radio links. Network emulators require many more independent channels than traditional channel emulators. This problem is particularly challenging for the real time channel simulator in the emulator. The challenges of designing a wireless network channel simulator are discussed and a design is presented on a Xilinx Virtex-II Pro FPGA. This channel simulator can model 210 independent channels between 15 nodes with a bandwidth of 90MHz. The performance of the design was verified by measuring transport-layer throughput between 802.11b radios transmitting through the channel simulator.}, booktitle={IEEE Vehicular Technology Conference}, author={Borries, K.C. and Judd, G. and Stancil, D.D. and Steenkiste, P.}, year={2009} }
 @inproceedings{cooper_stancil_2009, title={Improved channel sounding using zero correlation zone sequences}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-77951536816&partnerID=MN8TOARS}, DOI={10.1109/GLOCOM.2009.5426249}, abstractNote={Direct sequence spread spectrum (DSSS) techniques are commonly used for characterizing RF communications channels. These techniques have relative immunity to interference and do not require a direct reference connection between the transmitter and receiver. Current DSSS propagation measurement systems use a pseudo noise (PN) sequence to probe the impulse response of the channel. However, the use of PN sequences can introduce noise into the measurements. This noise is caused by a bias term that is inversely proportional to the length of the PN-Sequence, and limits the dynamic range of the measurement system. In this paper it is shown that this bias term will not be present when zero correlation zone (ZCZ) sequences are used. Consequently the dynamic range of the measurement system is limited by the SNR instead of the sequence itself. This paper also provides test data to show the effects of the bias term and to compare and contrast the use of PN and ZCZ sequences.}, booktitle={GLOBECOM - IEEE Global Telecommunications Conference}, author={Cooper, R.L. and Stancil, D.D.}, year={2009} }
 @article{cannon_stancil_2009, title={Magnetic Resonant Coupling As a Potential Means for Wireless Power Transfer to Multiple Small Receivers}, volume={24}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85008025176&partnerID=MN8TOARS}, DOI={10.1109/TPEL.2009.2017195}, abstractNote={Wireless power transfer via magnetic resonant coupling is experimentally demonstrated in a system with a large source coil and either one or two small receivers. Resonance between source and load coils is achieved with lumped capacitors terminating the coils. A circuit model is developed to describe the system with a single receiver, and extended to describe the system with two receivers. With parameter values chosen to obtain good fits, the circuit models yield transfer frequency responses that are in good agreement with experimental measurements over a range of frequencies that span the resonance. Resonant frequency splitting is observed experimentally and described theoretically for the multiple receiver system. In the single receiver system at resonance, more than 50% of the power that is supplied by the actual source is delivered to the load. In a multiple receiver system, a means for tracking frequency shifts and continuously retuning the lumped capacitances that terminate each receiver coil so as to maximize efficiency is a key issue for future work.}, number={7}, journal={IEEE Transactions on Power Electronics}, author={Cannon, B.L. and Stancil, D.D.}, year={2009}, pages={1819–1825} }
 @book{prabhakar_stancil_2009, title={Spin waves: Theory and applications}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84889770993&partnerID=MN8TOARS}, DOI={10.1007/978-0-387-77865-5}, abstractNote={Magnetostatic Waves.Major additions include quantum mechanical treatments of angular momentum, exchange, and spin waves; nonlinear phenomena such as solitons and chaos; and applications such as the generation of spin waves using current-induced spin torques.This book has been fun to write.We hope you find it to be an interesting and useful introduction to spin waves and their applications.}, journal={Spin Waves: Theory and Applications}, author={Prabhakar, A. and Stancil, D.D.}, year={2009}, pages={1–355} }
 @article{cheng_henty_cooper_stancil_bai_2008, title={A measurement study of time-scaled 802.11a waveforms over the mobile-to-mobile vehicular channel at 5.9 GHz}, volume={46}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-44449163929&partnerID=MN8TOARS}, DOI={10.1109/MCOM.2008.4511654}, abstractNote={We have studied the effects of the mobile vehicle-to-vehicle (V2V) channel on scaled versions of the current IEEE 802.11 a standard to investigate how readily they can be applied to vehicular networks. In particular, measured parameters for the V2V channel at 5.9 GHz in suburban, highway, and rural environments are studied in the context of critical parameters for OFDM. Actual performance of scaled OFDM waveforms with bandwidths of 20 MHz (bandwidth of IEEE 802.11 a), 10 MHz (bandwidth of the draft IEEE 802.11 p), and 5 MHz (halved bandwidth of IEEE 802.11 p) are described and interpreted in light of the channel parameters. At 20 MHz the guard interval is not long enough, while at 5 MHz errors increase from lack of channel stationarity over the packet duration. For these choices of the scaled 802.11 a OFDM waveform, 10 MHz appears to be the best choice.}, number={5}, journal={IEEE Communications Magazine}, author={Cheng, L. and Henty, B.E. and Cooper, R. and Stancil, D.D. and Bai, F.}, year={2008}, pages={84–91} }
 @inproceedings{henty_stancil_2008, title={Better wireless LAN coverage through ventilation duct antenna systems}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-51249105354&partnerID=MN8TOARS}, DOI={10.1109/ICC.2008.883}, abstractNote={This work presents fair comparisons of a ventilation duct based antenna system to a conventional wireless LAN access point installation, both inside and in areas around the outside of a building. We present comparisons of 3 different access point locations using signal strength measurements at nearly 100 different locations in the building for each location. We also present signal strength measurement comparisons as a user gets further and further away from the building outdoors. Lastly, we use this data to show that ventilation duct antenna systems can provide better signal strength inside a building resulting in improved user experience and in reduced system installation and life-cycle cost.}, booktitle={IEEE International Conference on Communications}, author={Henty, B.E. and Stancil, D.D.}, year={2008}, pages={4713–4717} }
 @inproceedings{cheng_henty_bai_stancil_2008, title={Doppler spread and coherence time of rural and highway vehicle-to-vehicle channels at 5.9 GHz}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-67249089056&partnerID=MN8TOARS}, DOI={10.1109/GLOCOM.2008.ECP.802}, abstractNote={An experimental study of the Doppler coherence time properties of Vehicle-to-Vehicle (V2V) wireless channels at 5.9 GHz in both rural and highway environments is presented. Simultaneous RF and mobility measurements were conducted in environments near Pittsburgh, Pennsylvania. The average Doppler spread was observed to depend linearly on effective speed, defined as the square root of the sum of the squares of the ground speeds of the two vehicles. Sample spectrum is analyzed and comparisons with the double-ring models are presented. The coherence time was observed to vary inversely with effective speed, as expected. In addition, the coherence time was observed to decrease with vehicle separation out to about 100 m, followed by a relative peak at about 200 m. A possible interpretation of this peak in terms of a two-ray propagation model is presented. The observed Doppler spread should not be a problem for proposed V2V OFDM signal transmission formats, but the channel coherence time is much shorter than a typical packet suggesting that present equalization schemes may not be adequate.}, booktitle={GLOBECOM - IEEE Global Telecommunications Conference}, author={Cheng, L. and Henty, B. and Bai, F. and Stancil, D.D.}, year={2008}, pages={4180–4185} }
 @article{van’t hof_stancil_2008, title={Eigenfrequencies of a truncated conical resonator via the classical and Wentzel-Kramers-Brillouin methods}, volume={56}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-49249120100&partnerID=MN8TOARS}, DOI={10.1109/TMTT.2008.927408}, abstractNote={The eigenfrequencies within a truncated conical cavity resonator have similarities to the eigenfrequencies within both the cylindrical and spherical cavity resonators. This paper first find the family of eigenfrequencies of the truncated conical cavity resonator by solving the classical boundary value problem in the spherical coordinate system, similar to a spherical cavity resonator. Next, eigenfrequencies for the truncated conical resonator are found via the cylindrical coordinate system using the Wentzel-Kramers-Brillouin (WKB) method by making the approximation that the truncated conical cavity with a small half-cone angle is a cylindrical cavity with linearly sloping walls. While the WKB method is an approximation to the actual eigenfrequencies, the solution yielded by this method is far more simple than the solution yielded by the classical boundary value method. Resonant frequencies are derived via both methods and are compared to each other and to measurements made in an experimental truncated conical cavity platform, displaying a very good agreement.}, number={8}, journal={IEEE Transactions on Microwave Theory and Techniques}, author={Van’T Hof, J.P. and Stancil, D.D.}, year={2008}, pages={1909–1916} }
 @inproceedings{cheng_henty_bai_stancil_2008, title={Highway and rural propagation channel modeling for vehicle-to-vehicle communications at 5.9 GHz}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-55649102714&partnerID=MN8TOARS}, DOI={10.1109/APS.2008.4619037}, abstractNote={In this article, we have reported experimental studies of signal strength as a function of vehicle separation for outdoor vehicle-to-vehicle propagation at 5.9 GHz. Statistical measurement campaigns were conducted in highway and rural driving environments. These measurements were used to obtain parameters for a dual-slope log-normal propagation model. The effects of antenna pattern variations for passing vehicles were also discussed.}, booktitle={2008 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, APSURSI}, author={Cheng, L. and Henty, B.E. and Bai, F. and Stancil, D.D.}, year={2008} }
 @inproceedings{cheng_henty_cooper_stancil_bai_2008, title={Multi-path propagation measurements for vehicular networks at 5.9 GHz}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-51649125658&partnerID=MN8TOARS}, booktitle={IEEE Wireless Communications and Networking Conference, WCNC}, author={Cheng, L. and Henty, B. and Cooper, R. and Stancil, D.D. and Bai, F.}, year={2008}, pages={1239–1244} }
 @inproceedings{welcome_2008, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-58149133502&partnerID=MN8TOARS}, DOI={10.1109/VETECF.2008.16}, booktitle={IEEE Vehicular Technology Conference}, year={2008} }
 @inproceedings{jiang_stancil_zhu_2007, title={Antenna array detection in highly cluttered environment using time reversal method}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-34748911740&partnerID=MN8TOARS}, DOI={10.1109/MWSYM.2007.380062}, abstractNote={This paper concerns a method of target detection in a cluttered environment where a significantly large number of highly reflective scattering objects exists. With the conventional Radar detection, the detection of a target additional to this highly scattering environment would suffer greatly in their detection dynamic range. In this paper, we present a novel time reversal method that enables automatic destructive interference of the field-probing electromagnetic wave on the reflective scatters of the environment such that the cluttered environment becomes virtually transparent. The experiment in lab tree-scattering environment demonstrates that this time reversal clutter-nulling scheme substantially enhances the detection dynamic range and the signal-to-noise ratio, significantly raising target detectability.}, booktitle={IEEE MTT-S International Microwave Symposium Digest}, author={Jiang, Y. and Stancil, D.D. and Zhu, J.-G.}, year={2007}, pages={1731–1734} }
 @inproceedings{henty_hess_stancil_2007, title={Crossed monopole array for single mode excitation of ventilation duct communication channels}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-48349115383&partnerID=MN8TOARS}, DOI={10.1109/APS.2007.4396094}, abstractNote={This work presents a novel antenna array for exciting a single mode of propagation in common ventilation ducts with a circular cross-section that are overmoded waveguides in the 2.4 GHz frequency band. By inverting the phase of one driven element with respect to the other, one of two modes can be selected for excitation, but in either case only a single mode is excited. We present the design technique and advantages of such an antenna array for use with IEEE 802.11g access points.}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Henty, B.E. and Hess, J. and Stancil, D.D.}, year={2007}, pages={2710–2713} }
 @inproceedings{hess_stancil_henty_2007, title={Design of an overmoded-waveguide directional antenna for use in in-building ventilation duct wireless networks}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-34748905415&partnerID=MN8TOARS}, DOI={10.1109/MWSYM.2007.380387}, abstractNote={We present an adaptation of a Yagi-Uda antenna design for use inside the overmoded waveguide environment of building ventilation ducts. We obtain experimentally the element size and spacing of a reflector and driven element that can be used for IEEE 802.11 b/g/n signals in a cylindrical duct to provide 3.1 dB of gain and a front-to-back ratio of 9.1 dB compared to a simple monopole antenna. We also discuss the usefulness of such an antenna in a duct network used to distribute wireless signals in a building.}, booktitle={IEEE MTT-S International Microwave Symposium Digest}, author={Hess, J.C. and Stancil, D.D. and Henty, B.E.}, year={2007}, pages={1221–1224} }
 @inproceedings{borries_stancil_2007, title={Efficient simulation of mobile-to-mobile rayleigh fading using Gaussian quadrature}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-34547292573&partnerID=MN8TOARS}, DOI={10.1109/VETECS.2007.121}, abstractNote={The Gaussian quadrature rules (GQRs) are used to construct a wireless fading simulator based on the popular sum of sinusoids (SoS) method. The general statistics of the proposed simulator are given. This simulator is also shown to perform well for important design parameters. An extension of the GQRs is employed to build uncorrelated simulators, which are important in frequency selective and MIMO simulators. These simulation techniques are then applied to the mobile-to-mobile (MtM) spectrum and are compared with the best known SoS techniques for the MtM spectrum. Although the proposed method is more complex, the efficiency and accuracy are significantly better than the previously proposed methods.}, booktitle={IEEE Vehicular Technology Conference}, author={Borries, K.C. and Stancil, D.D.}, year={2007}, pages={534–538} }
 @inproceedings{henty_stancil_2007, title={Experimental demonstration of time-reversal MISO and MIMO arrays with IEEE 802.11g devices through a ventilation duct channel}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-34547358756&partnerID=MN8TOARS}, DOI={10.1109/VETECS.2007.439}, abstractNote={A practical demonstration of IEEE 802.11g transmissions using time-reversal antenna arrays in MISO and MIMO configurations is presented in this work. Throughput measurements indicate significant channel improvement through the use of time-reversal array coefficients and illustrate the viability of increased access point (AP) capacity and co-channel interference reduction in multi-user scenarios.}, booktitle={IEEE Vehicular Technology Conference}, author={Henty, B.E. and Stancil, D.D.}, year={2007}, pages={2124–2128} }
 @article{stancil_2007, title={Long distance signaling using axionlike particles}, volume={76}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-37149049281&partnerID=MN8TOARS}, DOI={10.1103/PhysRevD.76.111701}, abstractNote={The possible existence of axionlike particles could lead to a new type of long-distance communication. In this work, basic antenna concepts are defined and a Friis-like equation is derived to facilitate long-distance link calculations. An example calculation is presented showing that communication over distances of 1000 km or more may be possible for m{sub a} 5x10{sup -8} GeV{sup -1}.}, number={11}, journal={Physical Review D - Particles, Fields, Gravitation and Cosmology}, author={Stancil, D.D.}, year={2007} }
 @article{cheng_henty_stancil_bai_mudalige_2007, title={Mobile vehicle-to-vehicle narrow-band channel measurement and characterization of the 5.9 GHz Dedicated Short Range Communication (DSRC) frequency band}, volume={25}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-35348932792&partnerID=MN8TOARS}, DOI={10.1109/JSAC.2007.071002}, abstractNote={This study presents narrow-band measurements of the mobile vehicle-to-vehicle propagation channel at 5.9 GHz, under realistic suburban driving conditions in Pittsburgh, Pennsylvania. Our system includes differential Global Positioning System (DGPS) receivers, thereby enabling dynamic measurements of how large-scale path loss, Doppler spectrum, and coherence time depend on vehicle location and separation. A Nakagami distribution is used for describing the fading statistics. The speed-separation diagram is introduced as a new tool for analyzing and understanding the vehicle-to-vehicle propagation environment. We show that this diagram can be used to model and predict channel Doppler spread and coherence time using vehicle speed and separation.}, number={8}, journal={IEEE Journal on Selected Areas in Communications}, author={Cheng, L. and Henty, B.E. and Stancil, D.D. and Bai, F. and Mudalige, P.}, year={2007}, pages={1501–1516} }
 @inproceedings{cheng_henty_stancil_bai_mudalige_2007, title={Phenomenological driving behavior model of the suburban vehicle-to-vehicle propagation cannel at 5.9 GHz}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-48649095901&partnerID=MN8TOARS}, DOI={10.1109/MOVE.2007.4300808}, abstractNote={Through a field implementation of vehicular ad hoc networks (VANET), we report the observation of a monotonic dependence of maximum relative velocity between two vehicles and their separation, for typical suburban driving. We introduce a hierarchical phenomenological model of driving behavior to describe this observation. As an example, we illustrate how we use this model to predict the expected Doppler shift with vehicle separation. Doppler shift computed from field measured spectra confirms the effectiveness of the model predictions. The model can be used to provide guidance in designing experiments with specific combinations of maximum velocity and separation, and to provide more accurate intelligent transportation systems (ITS) simulations.}, booktitle={2007 Mobile Networking for Vehicular Environments, MOVE}, author={Cheng, L. and Henty, B.E. and Stancil, D.D. and Bai, F. and Mudalige, P.}, year={2007}, pages={79–84} }
 @inproceedings{jiang_zhu_stancil_chabalko_2007, title={Polarization sensitive time reversal SAR imaging in an environment filled with trees}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-48349109803&partnerID=MN8TOARS}, DOI={10.1109/APS.2007.4396417}, abstractNote={In this paper, we present a time reversal SAR (TR-SAR) algorithm to improve the target images and reduce the ghost images by utilizing different polarizations in an environment filled with trees.}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Jiang, Y. and Zhu, J.-G. and Stancil, D.D. and Chabalko, M.J.}, year={2007}, pages={4000–4003} }
 @inproceedings{lin_henty_stancil_fan_mudalige_2007, title={Properties and applications of the suburban vehicle-to-vehicle propagation channel at 5.9 GHz}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-47349112422&partnerID=MN8TOARS}, DOI={10.1109/ICEAA.2007.4387252}, abstractNote={We describe a system capable of making channel measurements as a function of location while the vehicles are in motion to study the properties of the vehicle-to-vehicle wireless channel. We present results from on-road experimental tests in suburban areas of Pittsburgh. The dependence of Doppler spread on both velocity and vehicle separation is discussed. We introduce the speed-separation (S-S) diagram as a new tool for understanding and estimating Doppler spread in the vehicle-to-vehicle environment.}, booktitle={2007 International Conference on Electromagnetics in Advanced Applications, ICEAA'07}, author={Lin, C. and Henty, B.E. and Stancil, D.D. and Fan, B. and Mudalige, P.}, year={2007}, pages={121–124} }
 @inproceedings{stancil_gist_jiang_2007, title={REAL: The remote educational antenna laboratory}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-48349094871&partnerID=MN8TOARS}, DOI={10.1109/APS.2007.4396768}, abstractNote={The Remote Educational Antenna Laboratory is a new facility for the purpose of providing calibrated characterization of student constructed antennas. When completely operational, it will be available for use by students and instructors around the world, providing measurement experience to enhance and deepen the practical understanding of antennas.}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Stancil, D.D. and Gist, N. and Jiang, Y.}, year={2007}, pages={5399–5402} }
 @inproceedings{jiang_zhu_stancil_2007, title={Synthetic aperture radar ghost image cancellation using broadband time reversal averaging techniques}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-34748851324&partnerID=MN8TOARS}, DOI={10.1109/MWSYM.2007.380532}, abstractNote={In this paper, we present a time reversal averaging scheme for removing ghost images which occur in synthetic aperture radar (SAR) target imaging in a rich scattering environment. In the highly cluttered environment, the ghost images due to secondary scattering significantly deteriorate the quality of conventional SAR image. The time reversal (TR) method enables focusing on the target, significantly enhancing signal-to-noise ratio. By averaging TR-SAR images produced using different probing angles, the target image is coherently enhanced and the ghost images due to secondary scattering are significantly reduced. The effectiveness of the scheme is demonstrated via both computer simulation analysis and experimental measurements.}, booktitle={IEEE MTT-S International Microwave Symposium Digest}, author={Jiang, Y. and Zhu, J.-G. and Stancil, D.D.}, year={2007}, pages={1479–1482} }
 @inproceedings{jin_moura_jiang_stancil_o’donoughue_2007, title={Time reversal target classification from scattered radiation}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-47849113912&partnerID=MN8TOARS}, DOI={10.1109/SSP.2007.4301271}, abstractNote={This paper proposed the M-ary hypothesis testing algorithm for classifying radar backscatter signals from hidden targets in a rich scattering environment using time reversal. The target recognition algorithm is to be designed to distinguish measurements of the radar backscatter from an unknown object as belonging to one of a set of M classes. The proposed time reversal target classifier is, in essence, a correlator that calculates the cross-correlation of the normalized target signature waveforms with a data dependent quantity obtained from measurements. The algorithm requires a priori empirical statistical knowledge of the scattering channel, which is dependent of configurations of the scatterers in the environment. By incorporating time reversal, the proposed algorithm provides a significant performance improvement compared with the conventional method. Proof of concept is provided using electromagnetic data collected in a laboratory environment.}, booktitle={IEEE Workshop on Statistical Signal Processing Proceedings}, author={Jin, Y. and Moura, J.M.F. and Jiang, Y. and Stancil, D. and O’Donoughue, N.}, year={2007}, pages={317–321} }
 @article{strauss_apt_morgan_stancil_2006, title={Are personal electronics a threat to aircraft?}, volume={164}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33645962503&partnerID=MN8TOARS}, number={15}, journal={Aviation Week and Space Technology (New York)}, author={Strauss, B. and Apt, J. and Morgan, M.G. and Stancil, D.D.}, year={2006} }
 @inproceedings{moura_jin_stancil_zhu_cepni_jiang_henty_2006, title={Array processing using time reversal: Experiments and performance}, volume={4}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33947642478&partnerID=MN8TOARS}, booktitle={ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings}, author={Moura, J.M.F. and Jin, Y. and Stancil, D. and Zhu, J.-G. and Cepni, A. and Jiang, Y. and Henty, B.}, year={2006} }
 @inproceedings{cepni_stancil_henty_jiang_jin_moura_zhu_2006, title={Experimental results on single antenna target detection using time-reversal techniques}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-36148952206&partnerID=MN8TOARS}, DOI={10.1109/APS.2006.1710622}, abstractNote={In this paper, we describe a single antenna time-reversal based detection scheme that can be used to enhance the performance of a radar system in a multipath rich scattering environment. Using time-reversal, the response from a cluttered medium is first nulled. When the target enters into the medium, the electromagnetic energy focuses around the target so that a stronger echo is obtained. The experimental results show that depending on the amount of clutter in the medium, the performance of a radar detection scheme can be improved up to 4.8 dB using time-reversal methods with a single antenna}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Cepni, A.G. and Stancil, D.D. and Henty, B. and Jiang, Y. and Jin, Y. and Moura, J.M.F. and Zhu, J.-G.}, year={2006}, pages={703–706} }
 @inproceedings{mangharam_weller_stancil_rajkumar_parikh_2006, title={GrooveSim: A topography-accurate simulator for geographic routing in vehicular networks}, volume={2006}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33745964759&partnerID=MN8TOARS}, booktitle={VANET - Proceedings of the Second ACM International Workshop on Vehicular Ad Hoc Networks}, author={Mangharam, R. and Weller, D.S. and Stancil, D.D. and Rajkumar, R. and Parikh, J.S.}, year={2006}, pages={59–68} }
 @article{stancil_henty_cepni_van’t hof_2006, title={Observation of an inverse Doppler shift from left-handed dipolar spin waves}, volume={74}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33748184383&partnerID=MN8TOARS}, DOI={10.1103/PhysRevB.74.060404}, abstractNote={We report the experimental observation of an inverse Doppler shift from the motion of an ordinary solid object. The experiment used left-handed, or backward, spin waves in a magnetic thin film. As a pick-up antenna was moved toward the spin wave source, the measured frequency decreased. In contrast, an increase would be expected in everyday experience as the observer approaches the source. The backward spin wave wavelength in the experiment was 1.83 mm at 3 GHz, resulting in a Doppler shift of 546 Hz sec/m, or about 50 times larger than would be observed on an ordinary electromagnetic wave at the same frequency. The measured shifts and dispersion relation agree well with the established theory.}, number={6}, journal={Physical Review B - Condensed Matter and Materials Physics}, author={Stancil, D.D. and Henty, B.E. and Cepni, A.G. and Van’t Hof, J.P.}, year={2006} }
 @article{strauss_morgan_apt_stancil_2006, title={Unsafe at any airspeed?}, volume={43}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33644967622&partnerID=MN8TOARS}, DOI={10.1109/MSPEC.2006.1604840}, number={3}, journal={IEEE Spectrum}, author={Strauss, B. and Morgan, M.G. and Apt, J. and Stancil, D.D.}, year={2006}, pages={44–49} }
 @inproceedings{basset_alfaro_novosel_de la plaza_stancil_fedder_2005, title={"Chip-size" antennas for implantable sensors and smart dust}, volume={1}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-27544452980&partnerID=MN8TOARS}, DOI={10.1109/SENSOR.2005.1496453}, abstractNote={In this paper, we present the analysis, design and experimental results of /spl lambda//4-patch antennas operating at /spl sim/10 GHz. The ground plane has been adjusted to the patch area in order to drastically reduce the antenna size. Several geometries are presented, with HFSS simulation results. Impedance matching calculations for maximum power transfer between the antenna and the rectifying circuit is also presented. For a 4/spl times/5/spl times/1.6 mm/sup 3/ rectangular antenna fabricated on an RT/Duroid 5880 PCB, the measured maximum gain is 0.75 dB/sub i/ at 10.3 GHz.}, booktitle={Digest of Technical Papers - International Conference on Solid State Sensors and Actuators and Microsystems, TRANSDUCERS '05}, author={Basset, P. and Alfaro, F. and Novosel, D. and De La Plaza, A. and Stancil, D. and Fedder, G.K.}, year={2005}, pages={457–460} }
 @article{mangharam_meyers_rajkumar_stancil_parikh_krishnan_kellum_2005, title={A multi-hop mobile networking test-bed for telematics}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84877169488&partnerID=MN8TOARS}, DOI={10.4271/2005-01-1484}, abstractNote={An onboard vehicle-to-vehicle multi-hop wireless networking system has been developed to test the realworld performance of telematics applications. The system targets emergency and safety messaging, traffic updates, audio/video streaming and commercial announcements. The test-bed includes a Differential GPS receiver, an IEEE 802.11a radio card modified to emulate the DSRC standard, a 1xRTT cellular-data connection, an onboard computer and audio-visual equipment. Vehicles exchange data directly or via intermediate vehicles using a multi-hop routing protocol. The focus of the test-bed is to (a) evaluate the feasibility of high-speed inter-vehicular networking, (b) characterize 5.8GHz signal propagation within a dynamic mobile ad hoc environment, and (c) develop routing protocols for highly mobile networks. The test-bed has been deployed across five vehicles and tested over 400 miles on the road.}, journal={SAE Technical Papers}, author={Mangharam, R. and Meyers, J.J. and Rajkumar, R. and Stancil, D.D. and Parikh, J.S. and Krishnan, H. and Kellum, C.}, year={2005} }
 @inproceedings{zhu_jiang_stancil_moura_2005, title={A novel time reversal method for target detection in cluttered media}, volume={4 B}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33846902380&partnerID=MN8TOARS}, DOI={10.1109/APS.2005.1552760}, abstractNote={A cluttered environment with highly scattering objects significantly enhances the difficulty for detecting targets using electromagnetic waves. Time reversal methods have been developed in acoustic wave propagation. It has been shown that the super resolution focusing effect in acoustic wave propagation can also be achieved electromagnetic wave propagation. We present a novel time reversal method that nullifies the scattering objects to allow automatic focusing of the propagated electromagnetic wave on a target that is to be detected. Numerical simulations using the FDTD method have been carried out. The results show that the method significantly enhances the dynamic range of target detection in a highly scattering environment and could substantially increase target detectability.}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Zhu, J.-G. and Jiang, Y. and Stancil, D.D. and Moura, J.}, year={2005}, pages={135–138} }
 @article{nikitin_stancil_2005, title={Antenna radiation resistance in waveguide and in free-space}, volume={53}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-22444448668&partnerID=MN8TOARS}, DOI={10.1109/TAP.2005.848524}, abstractNote={In this paper, we discuss the connection between radiation resistance formulas for antenna in free-space and in rectangular waveguide. We demonstrate with the example of monopole antenna that a transformation between the angular direction in free-space and mode indices in waveguide makes the formulas for antenna radiation resistance in free-space and in rectangular waveguide equivalent to each other.}, number={6}, journal={IEEE Transactions on Antennas and Propagation}, author={Nikitin, P.V. and Stancil, D.D.}, year={2005}, pages={2126–2128} }
 @inproceedings{van’t hof_stancil_2005, title={Characterizing dispersion in the enclosed-space radio channel using a composite mode model}, volume={2005}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33744994571&partnerID=MN8TOARS}, DOI={10.1109/WCACEM.2005.1469710}, abstractNote={Wireless communications inside enclosed space environments (e.g. aircraft wings and fuselage, auto-mobile engine compartments, etc.) provides a unique opportunity for sensor networks and instrumentation systems native to these spaces to operate with improved reliability, flexibility and capabilities. Since these enclosed environments are typically surrounded by reflective boundaries (i.e. metallic walls), the enclosed-space radio channel is very dispersive and presents a significant challenge to radio communications. In this work, empirical dispersion measurements in representative enclosed space environments are made and a simple model which considers only the enclosure volume, surface area, conductivity and frequency of operation, is found to predict dispersion parameters in the enclosed space channel with good results.}, booktitle={2005 IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics}, author={Van’t Hof, J.P. and Stancil, D.D.}, year={2005}, pages={820–825} }
 @inproceedings{van’t hof_stancil_2005, title={Dispersion in the enclosed-space radio channel: Measurements and model}, volume={3 B}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33846900027&partnerID=MN8TOARS}, DOI={10.1109/APS.2005.1552477}, abstractNote={Sensor and instrumentation networks operating inside aircraft wings, unmanned air vehicle (UAV) fuselage, small submarine craft and/or automobile engine compartments could be significantly enhanced or enabled by implementing radio communications within these spaces. However, these enclosures are highly reverberant, and radio channel dispersion has been shown to be considerable in an empty-enclosure configuration. In this work, further dispersion measurements incorporating environmentally realistic objects are presented. Results are introduced that allow the channel dispersion parameters to be represented by a single measured channel parameter, making. an important advance towards complete enclosed space channel dispersion predictions.}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Van’t Hof, J.P. and Stancil, D.D.}, year={2005}, pages={225–228} }
 @inproceedings{cepni_stancil_zhu_jiang_2005, title={Experimental results on target detection in cluttered medium using electromagnetic time-reversal techniques}, volume={4 B}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33846895479&partnerID=MN8TOARS}, DOI={10.1109/APS.2005.1552761}, abstractNote={We describe an experimental technique that can be used to improve the detection performance of a radar system in cluttered environments. The detection algorithm depends on time-reversal techniques. By using time-reversal, the response from cluttered medium is first nulled. When the target enters into the medium, the electromagnetic energy focuses around the target so that a stronger echo is obtained. The initial experimental results show that using time-reversal techniques, we can improve the signal-to-noise ratio of the return-echo due to the target compared to conventional change-detection radar.}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Cepni, A.G. and Stancil, D.D. and Zhu, J.-G. and Jiang, Y.}, year={2005}, pages={139–142} }
 @inproceedings{henty_stancil_2005, title={Improved wireless performance from mode scattering in ventilation ducts}, volume={2 B}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33846870557&partnerID=MN8TOARS}, DOI={10.1109/APS.2005.1552093}, abstractNote={Ventilation ducts are a convenient infrastructure for distributing wireless signals indoors. Conventional and historical use of single conductor metal waveguides for transmission of communications signals has focused on careful excitation and control of mode content in the waveguide - something that is possibly infeasible or financially undesirable in a ventilation duct setting. With this in mind, we investigate the mode scattering effects present in a ventilation duct T-junction and note with some surprise that improvement in the performance of an IEEE 802.11g communication can result from this scattering.}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Henty, B.E. and Stancil, D.D.}, year={2005}, pages={638–641} }
 @article{herget_schesinger_stancil_2005, title={Mechanism for domain expansion in MAMMOS}, volume={41}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-27744540998&partnerID=MN8TOARS}, DOI={10.1109/TMAG.2005.854676}, abstractNote={A magnetic amplifying magnetooptical system (MAMMOS) model was created which calculates the size of the expanded domains in the readout layer by computing the forces on the domain wall. Using the model, the ratio of nucleation coercivity to domain wall motion coercivity, H/sub c,n//H/sub c,m/, was found to be an important factor governing the final expanded domain size in MAMMOS. Simulation results indicated that H/sub c,n//H/sub c,m/>5 is needed for a good readout signal. Experiments measuring the nucleation coercivity in localized areas on a MAMMOS readout layer agree with the modeling results. In the experiments, a wafer was patterned with islands of magnetic material and the switching behavior was measured. For a MAMMOS film, the ratio of H/sub c,n//H/sub c,m/ was measured to be 13 on average in a 400 /spl mu/m/sup 2/ area.}, number={10}, journal={IEEE Transactions on Magnetics}, author={Herget, P. and Schesinger, T.E. and Stancil, D.D.}, year={2005}, pages={2860–2862} }
 @inproceedings{herget_schlesinger_stancil_2005, title={Mechanism of domain expansion in MAMMOS}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-28444479132&partnerID=MN8TOARS}, booktitle={INTERMAG ASIA 2005: Digests of the IEEE International Magnetics Conference}, author={Herget, P. and Schlesinger, T.E. and Stancil, D.D.}, year={2005} }
 @inproceedings{cepni_stancil_jiang_zhu_2005, title={Microwave signal nulling using multiple antennas and time-reversal method}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84931438332&partnerID=MN8TOARS}, DOI={10.1109/VETECF.2005.1558131}, abstractNote={In this paper, we describe a multiple antenna microwave nulling technique that makes use of time-reversal concepts. The time-domain simulations and frequency domain experiments have shown that by using multiple antennas and time-reversal technique, we can maximize (focusing) as well as minimize (nulling) RF energy at active or passive target points in the medium. We have done experiments between 4 to 6 GHz in a laboratory environment. The degree of nulling as well as focusing depends on the multipath components in the channel and the bandwidth of the waveform. Using a 2-GHz bandwidth waveform, we have experimentally shown high-resolution microwave nulling results in a 2-D plane.}, booktitle={IEEE Vehicular Technology Conference}, author={Cepni, A.G. and Stancil, D.D. and Jiang, Y. and Zhu, J.}, year={2005}, pages={1274–1278} }
 @article{xhafa_tonguz_cepni_stancil_nikitin_brodtkorb_2005, title={On the capacity limits of HVAC duct channel for high-speed internet access}, volume={53}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-15544367680&partnerID=MN8TOARS}, DOI={10.1109/TCOMM.2004.841949}, abstractNote={In this paper, we report theoretical and experimental channel-capacity estimates of heating, ventilation, and air conditioning (HVAC) ducts based on multicarrier transmission that uses M-ary quadrature amplitude modulation and measured channel responses at the 2.4-GHz industrial, scientific, and medical band. It is shown theoretically that data rates in excess of 1 Gb/s are possible over distances up to 500 m in straight ducts in which reflections have been suppressed. Our experimental results also show that even in the case of more complex HVAC duct networks (i.e., HVAC duct networks that include bends, tees, etc.) data rates over 2 Gb/s are possible. Our estimations in this case are valid for distances of up to 22 m, which was the maximum distance of our experimental setup. These experimental results, measured with a large-scale testbed set up at Carnegie Mellon University, Pittsburgh, PA, albeit limited in terms of transmitter-receiver separation distance, provide further evidence on the potential of HVAC systems as an attractive solution for providing communications in indoor wireless networks.}, number={2}, journal={IEEE Transactions on Communications}, author={Xhafa, A.E. and Tonguz, O.K. and Cepni, A.G. and Stancil, D.D. and Nikitin, P.V. and Brodtkorb, D.}, year={2005}, pages={335–342} }
 @inproceedings{hess_henty_stancil_2005, title={Scalar network analysis of wireless channels using IEEE 802.11g transmissions}, volume={4}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84931413101&partnerID=MN8TOARS}, DOI={10.1109/VETECF.2005.1558943}, abstractNote={In this work we demonstrate the feasibility of scalar network analysis of wireless channels using an IEEE 802.11g waveform with a separate receiver. We explore the concept using a laboratory grade Orthogonal Frequency Division Multiplexing (OFDM) signal generator and spectrum analyzer. We also demonstrate the technique with field test equipment. All results are confirmed using a network analyzer. We find that utilizing field test equipment allows us to obtain valid channel responses and statistics. Keywords—channel characterization; scalar network analysis; IEEE 802.11g; OFDM.}, booktitle={IEEE Vehicular Technology Conference}, author={Hess, J.C. and Henty, B.E. and Stancil, D.D.}, year={2005}, pages={2226–2229} }
 @inproceedings{cepni_stancil_2005, title={Single antenna microwave nulling using time-reversal techniques}, volume={2005}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33749258392&partnerID=MN8TOARS}, DOI={10.1109/MWSYM.2005.1517050}, abstractNote={In this paper, we describe a single antenna microwave nulling technique that makes use of time-reversal concepts. The time-domain experiments have shown that by using single antenna and time-reversal technique, we can have focusing as well as nulling at any point in space. We have done experiments at 2.45 GHz in a cylindrical cavity environment. The degree of nulling (or focusing) depends on the multipath components in the channel as well as the bandwidth of the signal. The cavity provides a multipath rich-environment where we can show focusing and nulling by using a relatively small bandwidth compared to free space.}, booktitle={IEEE MTT-S International Microwave Symposium Digest}, author={Cepni, A.G. and Stancil, D.D.}, year={2005}, pages={1723–1726} }
 @inproceedings{moura_jin_stancil_zhu_cepni_jiang_henty_2005, title={Single antenna time reversal adaptive interference cancellation}, volume={IV}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33646784021&partnerID=MN8TOARS}, DOI={10.1109/ICASSP.2005.1416210}, abstractNote={This paper presents the time reversal adaptive interferer canceller (TRAIC), a novel algorithm that uses time reversal techniques to cancel the presence of interferers. TRAIC is developed for broadband signals and a single emitting antenna. Experimental tests in the electromagnetic domain show the viability and the power of TRAIC.}, booktitle={ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings}, author={Moura, J.M.F. and Jin, Y. and Stancil, D. and Zhu, J.-G. and Cepni, A. and Jiang, Y. and Henty, B.}, year={2005} }
 @inproceedings{stancil_cepni_henty_jiang_jin_zhu_moura_2005, title={Super-resolution focusing and nulling in rich multipath environments using time-reversal techniques}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84875360823&partnerID=MN8TOARS}, booktitle={ICEAA 2005 - 9th International Conference on Electromagnetics in Advanced Applications and EESC 2005 - 11th European Electromagnetic Structures Conference}, author={Stancil, D.D. and Cepni, A.G. and Henty, B.E. and Jiang, Y. and Jin, Y. and Zhu, J.-G. and Moura, J.M.F.}, year={2005}, pages={299–302} }
 @inproceedings{moura_jin_zhu_jiang_stancil_cepni_henty_2005, title={Waveform shaping for time reversal interference cancellation: A time domain approach}, volume={2005}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33847608422&partnerID=MN8TOARS}, booktitle={Conference Record - Asilomar Conference on Signals, Systems and Computers}, author={Moura, J.M.F. and Jin, Y. and Zhu, J.-G. and Jiang, Y. and Stancil, D. and Cepni, A. and Henty, B.}, year={2005}, pages={665–669} }
 @inproceedings{van’t hof_stancil_2005, title={Wireless sensors in reverberant enclosures: Characterizing a new radio channel}, volume={3}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-49249128055&partnerID=MN8TOARS}, DOI={10.1109/VETECF.2005.1558404}, abstractNote={Wireless sensor networks operating inside aircraft wings, unmanned air vehicles (UAV's), small submarines and/or automobile engine compartments experience a radio channel that can be highly reverberant and is not yet thoroughly characterized. To obtain a better understanding of these spaces as radio communications environments, measurements in the enclosed space radio channel are performed and models are presented that describe the channel dispersion properties. Communications performance is evaluated using a signal excitation/analysis method using a variety of signaling techniques and in several different frequency bands.}, booktitle={IEEE Vehicular Technology Conference}, author={Van’T Hof, J.P. and Stancil, D.D.}, year={2005}, pages={1747–1750} }
 @article{tonguz_xhafa_stancil_cepni_nikitin_brodtkorb_2004, title={A simple path-loss prediction model for HVAC systems}, volume={53}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-3943088428&partnerID=MN8TOARS}, DOI={10.1109/TVT.2004.830143}, abstractNote={In this paper, we present a simple path-loss prediction model for link budget analysis in indoor wireless local area networks that use heating, ventilation, and air conditioning (HVAC) cylindrical ducts in the 2.4-2.5-GHz industrial, scientific, and medical band. The model we propose predicts the average power loss between a transmitter-receiver pair in an HVAC duct network. This prediction model greatly simplifies the link budget analysis for a complex duct network, making it a convenient and simple tool for system design. The accuracy of our prediction model is verified by an extensive set of experimental measurements.}, number={4}, journal={IEEE Transactions on Vehicular Technology}, author={Tonguz, O.K. and Xhafa, A.E. and Stancil, D.D. and Cepni, A.G. and Nikitin, P.V. and Brodtkorb, D.}, year={2004}, pages={1203–1214} }
 @inproceedings{henty_stancil_2004, title={Bandwidth limitations of phase-conjugate arrays used for multipath focusing}, volume={3}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-4544286650&partnerID=MN8TOARS}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Henty, B.E. and Stancil, D.D.}, year={2004}, pages={2792–2795} }
 @inproceedings{cepni_stancil_xhafa_henty_nikitin_tonguz_brodtkorb_2004, title={Capacity of multi-antenna array systems for HVAC ducts}, volume={5}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-4143088282&partnerID=MN8TOARS}, booktitle={IEEE International Conference on Communications}, author={Cepni, A.G. and Stancil, D.D. and Xhafa, A.E. and Henty, B. and Nikitin, P.V. and Tonguz, O.K. and Brodtkorb, D.}, year={2004}, pages={2934–2938} }
 @inproceedings{nikitin_stancil_2004, title={Connection between radiation resistances of antenna in rectangular waveguide and in free-space}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-4544374057&partnerID=MN8TOARS}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Nikitin, P.V. and Stancil, D.D.}, year={2004}, pages={2035–2038} }
 @inproceedings{cepni_stancil_brodtkorb_2004, title={Experimental mode content analysis technique for complex overmoded waveguide systems}, volume={3}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-4544387483&partnerID=MN8TOARS}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Cepni, A.G. and Stancil, D.D. and Brodtkorb, D.}, year={2004}, pages={2991–2994} }
 @inproceedings{herget_schlesinger_bain_stancil_awano_2004, title={MAMMOS read only memory}, volume={5380}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-10044240796&partnerID=MN8TOARS}, DOI={10.1117/12.556950}, abstractNote={The concept of a low cost, single layer read only memory (ROM) compatible with the magnetic amplifying magneto-optical system (MAMMOS) is introduced. This ROM technology relies on the creation of nucleation sites in the medium for information storage and read back. Several methods of implementing the MAMMOS ROM are proposed and the distribution of nucleation sites is experimentally investigated to gain a better understanding of how to control these sites.}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Herget, P. and Schlesinger, T.E. and Bain, J.A. and Stancil, D.D. and Awano, H.}, year={2004}, pages={163–170} }
 @article{henty_stancil_2004, title={Multipath-enabled super-resolution for rf and microwave communication using phase-conjugate arrays}, volume={93}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-37649029077&partnerID=MN8TOARS}, DOI={10.1103/PhysRevLett.93.243904}, abstractNote={We demonstrate experimentally that phase-conjugate techniques can be used to achieve super-resolution focusing of electromagnetic waves in a multipath indoor environment at 2.45 GHz. The focusing phenomena was used to direct independent signals to two locations separated by approximately one-half wavelength, thereby creating two simultaneous channels at the same frequency. An increase in channel capacity is shown to be achievable by an experimental transmission of a 1 Mbps signal over two channels created using a four element phase-conjugate array.}, number={24}, journal={Physical Review Letters}, author={Henty, B.E. and Stancil, D.D.}, year={2004} }
 @inproceedings{van’t hof_stancil_2004, title={Studying the communications potential of the enclosed-space radio channel}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-4544278644&partnerID=MN8TOARS}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Van’t Hof, J.P. and Stancil, D.D.}, year={2004}, pages={1668–1671} }
 @article{herget_schlesinger_stancil_2004, title={Theoretical Limit to Domain Position Detection Magnetic Amplifying Magnetooptical System}, volume={40}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-1342286848&partnerID=MN8TOARS}, DOI={10.1109/TMAG.2003.821566}, abstractNote={We developed a model that was used to evaluate the performance of a domain position detection magnetic amplifying magnetooptical system (DPD-MAMMOS). Through the use of the model, we explain the operation of DPD-MAMMOS and demonstrate its advantages. Next, we evaluated the performance of DPD-MAMMOS under the influences of position noise from a theoretical point of view. From this analysis, we estimate that a MAMMOS system will need to attain 30 nm or less of position noise to show a density advantage when used with DPD-MAMMOS.}, number={1 I}, journal={IEEE Transactions on Magnetics}, author={Herget, P. and Schlesinger, T.E. and Stancil, D.D.}, year={2004}, pages={105–111} }
 @article{rausch_bain_stancil_schlesinger_2004, title={Thermal Williams-Comstock Model for Predicting Transition Lengths in a Heat-Assisted Magnetic Recording System}, volume={40}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-1342308091&partnerID=MN8TOARS}, DOI={10.1109/TMAG.2003.821569}, abstractNote={A thermal Williams-Comstock recording model was developed to predict the transition length in a longitudinal heat-assisted magnetic recording system. In this paper, we compare the results from the model to experimentally determined transition lengths from a dual-sided heat-assisted magnetic recording spin stand. We found both experimentally and theoretically that there exists an optimal alignment between the thermal profile and the magnetic head, which minimizes the transition length. By properly optimizing the write current and laser power, it was possible to record transitions shorter then those attainable with conventional longitudinal recording.}, number={1 I}, journal={IEEE Transactions on Magnetics}, author={Rausch, T. and Bain, J.A. and Stancil, D.D. and Schlesinger, T.E.}, year={2004}, pages={137–147} }
 @inproceedings{chen_itagi_stebounova_bain_stancil_walker_schlesinger_2003, title={A Study of Near-field Aperture Geometry Effects on Very Small Aperture Lasers (VSAL)}, volume={5069}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0242443352&partnerID=MN8TOARS}, DOI={10.1117/12.532753}, abstractNote={We have investigated nano-apertures with different geometries on VSALs using far-field measurements, near-field measurements, and finite difference time domain (FDTD) simulation methods. We were able to quantitatively verify the aperture geometry dependent power throughput in all three methods. From both far-field measurements and FDTD simulation results, we conclude that for the apertures of the same area, a rectangular aperture with the long side perpendicular to the active layer has the largest throughput, while a circular aperture has the second largest, and the rectangular aperture with the long side parallel to the active layer has the least throughput among the three. We have attempted to correlate the relationship between far-field power and near-field power. Employing an apertureless near-field scanning optical microscopy (NSOM), we found that for the two rectangular apertures being studied, the near-field power throughput results was consistent to that of far-field measurement. Using VSALs as a near-field aperture testbed was also proposed and demonstrated.}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Chen, F. and Itagi, A. and Stebounova, L. and Bain, J.A. and Stancil, D.D. and Walker, G.C. and Schlesinger, T.E.}, year={2003}, pages={312–318} }
 @article{nikitin_stancil_cepni_xhafa_tonguz_brodtkorb_2003, title={A novel mode content analysis technique for antennas in multimode waveguides}, volume={51}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0742269425&partnerID=MN8TOARS}, DOI={10.1109/TMTT.2003.820171}, abstractNote={This paper presents a novel technique for analyzing the mode content excited by antennas placed in multimode waveguides. The technique is based on measuring the frequency response between the two antennas coupled into a waveguide and using that information to extract the mode content generated by the transmitting antenna. The technique is applicable to cases in which the mode amplitudes are approximately constant over the frequency range of interest. This method is valuable for determining the mode mix generated by arbitrary transmitting antennas in a multimode waveguide propagation environment. An example of such an environment is heating, ventilation, and air-conditioning (HVAC) ducts used for indoor communications, where an important antenna characteristic is the mode sensitivity (analogous to the antenna directive gain in free space). We validate our technique with the example of a monopole probe antenna coupled into a multimode cylindrical HVAC duct.}, number={12}, journal={IEEE Transactions on Microwave Theory and Techniques}, author={Nikitin, P.V. and Stancil, D.D. and Cepni, A.G. and Xhafa, A.E. and Tonguz, O.K. and Brodtkorb, D.}, year={2003}, pages={2402–2408} }
 @inproceedings{nikitin_stancil_cepni_xhafa_tonguz_areklett_brodtkorb_2003, title={Antennas in a waveguide propagation environment}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0042972878&partnerID=MN8TOARS}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Nikitin, P.V. and Stancil, D.D. and Cepni, A.G. and Xhafa, A.E. and Tonguz, O.K. and Areklett, K. and Brodtkorb, D.}, year={2003}, pages={1181–1184} }
 @article{chen_stancil_schlesinger_2003, title={Aperture shape effect on the performance of very small aperture lasers}, volume={93}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0037636605&partnerID=MN8TOARS}, DOI={10.1063/1.1568150}, abstractNote={We report on the effect of different aperture shapes on the power output of a very small aperture laser (VSAL) fabricated from commercial edge-emitting laser diodes and correlate the results to the layer structure and polarization of the optical field. A waveguide theory is used to explain the experimental observations. We show that the shape of the aperture has a significant effect on the VSAL output power. In particular shapes exploiting the asymmetry of the laser can achieve much higher throughput over square apertures while keeping the aperture area constant. This work also indicates the validity of analyzing near-field small apertures as cutoff waveguide structures.}, number={10 1}, journal={Journal of Applied Physics}, author={Chen, F. and Stancil, D.D. and Schlesinger, T.E.}, year={2003}, pages={5871–5874} }
 @article{herget_schlesinger_stancil_2003, title={Domain position detection magnetic amplifying magneto-optical system (MAMMOS)}, volume={42}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0038059394&partnerID=MN8TOARS}, number={2 B}, journal={Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers}, author={Herget, P. and Schlesinger, T.E. and Stancil, D.D.}, year={2003}, pages={1080–1081} }
 @inproceedings{itagi_schlesinger_bain_stancil_2003, title={Efficiency of light coupling from a light delivery system to a planar waveguide for optical and hybrid recording heads}, volume={5069}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0242467763&partnerID=MN8TOARS}, DOI={10.1117/12.533126}, abstractNote={The efficiency of end-fire coupling between a light delivery system and a planar waveguide for optical and hybrid recording heads is calculated using amode matching technique.}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Itagi, A.V. and Schlesinger, T.E. and Bain, J.A. and Stancil, D.D.}, year={2003}, pages={341–344} }
 @article{rausch_bain_stancil_schlesinger_challener_mcdaniel_deeman_brucker_2003, title={Experimental effects of laser power on the writability and pulse width in a heat assisted longitudinal recording system}, volume={42}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0038325743&partnerID=MN8TOARS}, number={2 B}, journal={Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers}, author={Rausch, T. and Bain, J.A. and Stancil, D.D. and Schlesinger, T.E. and Challener, W.A. and McDaniel, T. and Deeman, N. and Brucker, C.}, year={2003}, pages={989–994} }
 @article{chen_itagi_bain_stancil_schlesinger_stebounova_walker_akhremitchev_2003, title={Imaging of optical field confinement in ridge waveguides fabricated on very-small-aperture laser}, volume={83}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0242413207&partnerID=MN8TOARS}, DOI={10.1063/1.1621088}, abstractNote={Optical field confinement in a ridge waveguide nanostructure (“C” aperture) designed for ultrahigh-density recording was observed using an apertureless near-field scanning optical microscope. The aperture was fabricated on a commercial edge-emitting semiconductor laser as the light source. High-contrast near-field images at both 1× and 2× lock-in detection frequencies were obtained. The emission patterns are in agreement with theoretical simulation of such structures. A 90 nm×70 nm full width half maximum spot size was measured and is comparable to the ridge width of the aperture.}, number={16}, journal={Applied Physics Letters}, author={Chen, F. and Itagi, A. and Bain, J.A. and Stancil, D.D. and Schlesinger, T.E. and Stebounova, L. and Walker, G.C. and Akhremitchev, B.B.}, year={2003}, pages={3245–3247} }
 @article{nikitin_stancil_tonguz_xhafa_cepni_brodtkorb_2003, title={Impulse response of the HVAC duct as a communication channel}, volume={51}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0242270882&partnerID=MN8TOARS}, DOI={10.1109/TCOMM.2003.818098}, abstractNote={Heating, ventilation, and air conditioning (HVAC) ducts in buildings behave as multimode waveguides when excited at radio frequencies and thus, can be used to distribute radio signals. The channel properties of the ducts are different from the properties of a usual indoor propagation channel. In this paper, we describe physical mechanisms which affect the HVAC channel impulse response and analyze their influence on the delay spread. Those mechanisms include antenna coupling, attenuation, and three types of dispersion: intramodal, intermodal, and multipath. We analyze each type separately and explore the behavior of the delay spread as a function of distance in straight ducts. Experimental channel measurements taken on real ducts confirm the validity of our model.}, number={10}, journal={IEEE Transactions on Communications}, author={Nikitin, P.V. and Stancil, D.D. and Tonguz, O.K. and Xhafa, A.E. and Cepni, A.G. and Brodtkorb, D.}, year={2003}, pages={1736–1742} }
 @inproceedings{nikitin_stancil_cepni_xhafa_tonguz_brodtkorb_2003, title={Novel mode content analysis technique for multimode waveguides}, volume={3}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0043092531&partnerID=MN8TOARS}, booktitle={IEEE MTT-S International Microwave Symposium Digest}, author={Nikitin, P.V. and Stancil, D.D. and Cepni, A.G. and Xhafa, A.E. and Tonguz, O.K. and Brodtkorb, D.}, year={2003}, pages={1827–1830} }
 @article{nikitinj_stancil_cepni_tonguz_xhafa_brodtkorb_2003, title={Propagation model for the HVAC duct as a communication channel}, volume={51}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0042703881&partnerID=MN8TOARS}, DOI={10.1109/TAP.2003.811491}, abstractNote={Heating, ventilation, and air conditioning (HVAC) ducts in buildings are typically hollow metal pipes which can be used as waveguides to carry signals and provide network access to offices. Knowledge of channel properties is crucial to designing such a communication system. The paper presents a propagation model for a straight HVAC duct terminated at both ends. At high frequencies, this duct behaves as a multimode waveguide with a transmitting antenna coupling in and a receiving antenna coupling out. We derive a simple analytical expression for the frequency response of this channel using conventional techniques. Experimental data taken on real circular ducts excited by monopole probe antennas confirm the theoretical results. This model represents an initial step toward the development of a tool for planning a wireless distribution system using building HVAC ducts.}, number={5}, journal={IEEE Transactions on Antennas and Propagation}, author={Nikitinj, P.V. and Stancil, D.D. and Cepni, A.G. and Tonguz, O.K. and Xhafa, A.E. and Brodtkorb, D.}, year={2003}, pages={945–951} }
 @inproceedings{nikitin_stancil_cepni_xhafa_tonguz_brodtkorb_2003, title={Propagation modelling of complex HVAC networks using transfer matrix method}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0042473203&partnerID=MN8TOARS}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Nikitin, P.V. and Stancil, D.D. and Cepni, A.G. and Xhafa, A.E. and Tonguz, O.K. and Brodtkorb, D.}, year={2003}, pages={126–129} }
 @article{itagi_schlesinger_stancil_2003, title={Refraction theory for planar waveguides: Modeling of a mode index integrated solid immersion lens}, volume={42}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0038736855&partnerID=MN8TOARS}, number={2 B}, journal={Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers}, author={Itagi, A.V. and Schlesinger, T.E. and Stancil, D.D.}, year={2003}, pages={740–749} }
 @article{itagi_stancil_bain_schlesinger_2003, title={Ridge waveguide as a near-field optical source}, volume={83}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0348107250&partnerID=MN8TOARS}, DOI={10.1063/1.1631057}, abstractNote={We investigate the feasibility of using a ridge waveguide at optical frequencies as a near-field optical transducer, using the finite difference time domain method. The complete electromagnetic field picture of the ridge waveguide, in the absence and presence of the irradiated medium, is presented. A power efficiency of 7% and an optical spot with full width half maximum of 50 nm×80 nm is obtained in the medium. We show that impedance considerations play a major role in the transducer-medium optical coupling.}, number={22}, journal={Applied Physics Letters}, author={Itagi, A.V. and Stancil, D.D. and Bain, J.A. and Schlesinger, T.E.}, year={2003}, pages={4474–4476} }
 @inproceedings{xhafa_sonthikorn_tonguz_nikitin_cepni_stancil_henty_brodtkorb_2003, title={Seamless Handover in Buildings Using HVAC Ducts: A New System Architecture}, volume={6}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0842267553&partnerID=MN8TOARS}, booktitle={Conference Record / IEEE Global Telecommunications Conference}, author={Xhafa, A.E. and Sonthikorn, P. and Tonguz, O.K. and Nikitin, P.V. and Cepni, A.G. and Stancil, D.D. and Henty, B. and Brodtkorb, D.}, year={2003}, pages={3093–3097} }
 @inproceedings{tonguz_stancil_xhafa_cepni_nikitin_brodtkorb_2002, title={An empirical path loss model for HVAC duct systems}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0036967476&partnerID=MN8TOARS}, booktitle={Conference Record / IEEE Global Telecommunications Conference}, author={Tonguz, O.K. and Stancil, D.D. and Xhafa, A.E. and Cepni, A.G. and Nikitin, P.V. and Brodtkorb, D.}, year={2002}, pages={1850–1854} }
 @article{schlesinger_rausch_itagi_zhu_bain_stancil_2002, title={An integrated read/write head for hybrid recording}, volume={41}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0036509236&partnerID=MN8TOARS}, number={3 B}, journal={Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers}, author={Schlesinger, T.E. and Rausch, T. and Itagi, A. and Zhu, J. and Bain, J.A. and Stancil, D.D.}, year={2002}, pages={1821–1824} }
 @inproceedings{herget_schlesinger_stancil_2002, title={Domain position detection MAMMOS}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84962910729&partnerID=MN8TOARS}, DOI={10.1109/OMODS.2002.1028702}, abstractNote={This paper introduces a new technique for reading and writing data in a MAMMOS system in which the position rather than the presence of domains is detected. We will refer to this new technique as domain position detection or DPD-MAMMOS. DPD-MAMMOS has several advantages over conventional MAMMOS and mitigates a number of common problems. Through computer simulation, it is shown how this technique can increase power margins and increase storage density. At the same time, DPD-MAMMOS eliminates the need for clock recovery, and relaxes the requirements on coil design.}, booktitle={2002 International Symposium on Optical Memory and Optical Data Storage Topical Meeting, ISOM/ODS 2002 - Joint International Symposium on Optical Memory and Optical Data Storage 2002, Technical Digest}, author={Herget, P. and Schlesinger, T.E. and Stancil, D.D.}, year={2002}, pages={22–24} }
 @article{doubling wireless channel capacity using co-polarised, co-located electric and magnetic dipoles_2002, volume={38}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0037019195&partnerID=MN8TOARS}, DOI={10.1049/el:20020442}, abstractNote={Experiments are described demonstrating the ability to realise independent information channels using co-located, co-polarised electric and magnetic dipoles in the presence of multipath propagation. The calculated information capacity is in good agreement with a random matrix channel model.}, number={14}, journal={Electronics Letters}, year={2002}, pages={746–747} }
 @inproceedings{rausch_bain_stancil_schlesinger_challener_mcdaniel_deeman_brucker_2002, title={Experimental effects of laser power on the writability and PW<inf>50</inf> in a heat assisted longitudinal recording system}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84962878574&partnerID=MN8TOARS}, DOI={10.1109/OMODS.2002.1028601}, abstractNote={In a heat assisted magnetic recording (HAMR) system, light from a laser diode is used to heat the medium which assists in the recording process by temporarily reducing the coercivity during writing. The recorded marks are read back using a magnetoresistive (MR) sensor that senses the stray flux from a magnetic transition. In this paper we examine the effects of the laser power on the writability and the pulse width at half maximum (PW/sub 50/) for granular longitudinal media.}, booktitle={2002 International Symposium on Optical Memory and Optical Data Storage Topical Meeting, ISOM/ODS 2002 - Joint International Symposium on Optical Memory and Optical Data Storage 2002, Technical Digest}, author={Rausch, T. and Bain, J.A. and Stancil, D.D. and Schlesinger, T.E. and Challener, W.A. and McDaniel, T. and Deeman, N. and Brucker, C.}, year={2002}, pages={162–164} }
 @article{herget_van kesteren_verschuren_stancil_schlesinger_2002, title={Experimental investigation of domain expansion speeds in MAMMOS}, volume={38}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0036762385&partnerID=MN8TOARS}, DOI={10.1109/TMAG.2002.801856}, abstractNote={Summary form only given. Since high data rates are critical to the success of MAMMOS (magnetically amplified magneto-optical disc system) technology, expansion and collapse speeds of magnetic domains have become a topic of recent interest. To date, the expansion speed in a MAMMOS system has not been directly measured. One way to measure the speed, is by observing the rise and fall times of the magneto-optic readback signal and inferring wall velocities from these times. To measure the rise and fall times experimentally, a MAMMOS system with a 658 nm laser and 0.6 NA lens was equipped with a high-speed photo detector recently developed at Philips. Using this system, MAMMOS readout signals were collected for various laser powers and readout fields using a LaCroy DDA-110 to sample the photo detector output at 2 GHz.}, number={5 I}, journal={IEEE Transactions on Magnetics}, author={Herget, P. and Van Kesteren, H.W. and Verschuren, C.A. and Stancil, D.D. and Schlesinger, T.E.}, year={2002}, pages={2099–2101} }
 @inproceedings{rausch_herget_bain_zhu_stancil_schlesinger_2002, title={Experimental test bed for hybrid recording}, volume={4342}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0036379974&partnerID=MN8TOARS}, DOI={10.1117/12.453398}, abstractNote={An experimental test bed for investigating the hybrid recording process and that allows for the precise visual alignment of the optical spot and magnetic head is described. Using this spin stand experiments have been performed on three types of hybrid recording where the critical bit dimensions are determined by using either, or both, the thermal and magnetic field profiles. By changing the relative alignment of the optical spot and magnetic head in the down track position four distinct types of marks unique to the hybrid recording process are observed.}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Rausch, T. and Herget, P. and Bain, J.A. and Zhu, J. and Stancil, D.D. and Schlesinger, T.E.}, year={2002}, pages={502–510} }
 @inproceedings{karns_stancil_vijaya kumar_schlesinger_2002, title={High density substrate incident magneto-optic recording using a solid immersion lens}, volume={4342}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0036381204&partnerID=MN8TOARS}, DOI={10.1117/12.453384}, abstractNote={A system demonstrating ultra-high optical recording densities is presented. A substrate incident solid immersion lens was implemented and integrated into a blue wavelength optical spin stand. The spin stand was designed to work without a focus or tracking servo. The optical readout spot size was determined to be approximately 250 nm from the impulse response of the system and was also verified by swept sine wave methods. The system signal-to-noise characteristics were determined by integration of the Fourier decomposition of the readout signal and by autocorrelation techniques. The signal to noise ratio for low frequency data was 23 dB. Finally, domains as small as 80 nm were recorded and readout using this system and the associated signal to noise ratio was shown to be approximately 10 dB.}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Karns, D. and Stancil, D.D. and Vijaya Kumar, B.V.K. and Schlesinger, T.E.}, year={2002}, pages={213–219} }
 @article{herget_rausch_shiela_stancil_schlesinger_zhu_bain_2002, title={Mark shapes in hybrid recording}, volume={80}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-79956047799&partnerID=MN8TOARS}, DOI={10.1063/1.1454230}, abstractNote={We describe the theoretical and experimental investigation of mark shapes in thermally assisted or hybrid recording. The effect of alignment was studied by recording marks on perpendicular TbFeCo media using a commercial recording head and 840 nm laser. We found that mark shapes are primarily controlled through laser/head alignment, and that maximally straight transitions are obtained by placing the laser spot on the leading pole tip near the gap. Simulations of the recording process confirm the experimental findings and are used in conjunction with static write contours to show how transitions form.}, number={10}, journal={Applied Physics Letters}, author={Herget, P. and Rausch, T. and Shiela, A.C. and Stancil, D.D. and Schlesinger, T.E. and Zhu, J.-G. and Bain, J.A.}, year={2002}, pages={1835–1837} }
 @inproceedings{cepni_xhafa_nikitin_stancil_tonguz_brodtkorb_2002, title={Multi-carrier signal transmission through HVAC ducts: Experimental results for channel capacity}, volume={56}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0036447404&partnerID=MN8TOARS}, number={1}, booktitle={IEEE Vehicular Technology Conference}, author={Cepni, A.G. and Xhafa, A.E. and Nikitin, P.V. and Stancil, D.D. and Tonguz, O.K. and Brodtkorb, D.}, year={2002}, pages={331–335} }
 @inproceedings{itagi_chen_stancil_schlesinger_2002, title={Optical fields of a sub-wavelength metal aperture in a Very Small Aperture Laser (VSAL)}, volume={4342}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0036386243&partnerID=MN8TOARS}, DOI={10.1117/12.453436}, abstractNote={The effect of metal thickness on the transmitted optical field of a sub-wavelength metal aperture on a Very Small Aperture Laser (VSAL) is modeled and studied experimentally. The experimental results were obtained in the far field, on a VSAL fabricated from a commercial semiconductor diode laser using Focused Ion Beam Etching (FIBE). The optical field in the near-field region of the VSAL was modeled by the Finite Difference Time Domain (FDTD) method. In this model, the laser was assumed to be decoupled from the aperture.}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Itagi, A. and Chen, F. and Stancil, D.D. and Schlesinger, T.E.}, year={2002}, pages={277–284} }
 @inproceedings{nikitin_stancil_tonguz_xhafa_cepni_2002, title={RF propagation in an HVAC duct system: Impulse response characteristics of the channel}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0036075825&partnerID=MN8TOARS}, booktitle={IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)}, author={Nikitin, P.V. and Stancil, D.D. and Tonguz, O.K. and Xhafa, A.E. and Cepni, A.G.}, year={2002}, pages={726–729} }
 @inproceedings{itagi_schlesinger_stancil_2002, title={Refraction analysis at a step discontinuity of a three-dimensional multimode slab waveguide for incident modes with arbitrary direction}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84962815566&partnerID=MN8TOARS}, DOI={10.1109/OMODS.2002.1028650}, abstractNote={In this paper we present an analysis for the refraction of modes at the step discontinuity of a multimode slab waveguide. This analysis can be used analogous to ray tracing in conventional optics to obtain focusing properties of waveguide lenses. Apart from application in optical heads, this analysis finds application in communication systems that make widespread use of integrated optics.}, booktitle={2002 International Symposium on Optical Memory and Optical Data Storage Topical Meeting, ISOM/ODS 2002 - Joint International Symposium on Optical Memory and Optical Data Storage 2002, Technical Digest}, author={Itagi, A. and Schlesinger, T.E. and Stancil, D.D.}, year={2002}, pages={308–310} }
 @article{xhafa_tonguz_cepni_stancil_nikitin_brodtkorb_2002, title={Theoretical estimates of HVAC duct channel capacity for high-speed internet access}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0036279625&partnerID=MN8TOARS}, DOI={10.1109/ICC.2002.996993}, abstractNote={We report theoretical channel capacity estimates of heating, ventilation, and air-conditioning (HVAC) ducts based on multi-carrier transmission that uses M-QAM modulation and measured channel responses at 2.4 GHz Industrial, Scientific, and Medical (ISM) band. It is shown that, data rates in excess of 1 Gbps are possible over distances up to 500 m in "matched" ducts (one can think of "matched" ducts as user-friendly ducts, since "matching" can, in principle, eliminate all the multipath reflections in HVAC ducts). Our work also shows that data rates in excess of 300 Mbps are possible over distances up to 500 m even in the presence of significant multipath reflections.}, journal={IEEE International Conference on Communications}, author={Xhafa, A.E. and Tonguz, O.K. and Cepni, A.G. and Stancil, D.D. and Nikitin, P.V. and Brodtkorb, D.}, year={2002}, pages={936–939} }
 @inproceedings{van’t hof_stancil_2002, title={Ultra-wideband high data rate short range wireless links}, volume={1}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0036055918&partnerID=MN8TOARS}, booktitle={IEEE Vehicular Technology Conference}, author={Van’t Hof, J.P. and Stancil, D.D.}, year={2002}, pages={85–89} }
 @inproceedings{punnoose_tseng_wang_nikitin_schlesinger_stancil_2001, title={Communications resources management for advanced telematics applications}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0034774572&partnerID=MN8TOARS}, booktitle={IEEE Conference on Intelligent Transportation Systems, Proceedings, ITSC}, author={Punnoose, R.J. and Tseng, R.S. and Wang, S. and Nikitin, P.V. and Schlesinger, T.E. and Stancil, D.D.}, year={2001}, pages={1056–1060} }
 @article{punnoose_tseng_stancil_2001, title={Experimental results for interference between Bluetooth and IEEE 802.11b DSSS systems}, volume={1}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0035189547&partnerID=MN8TOARS}, DOI={10.1109/VTC.2001.956557}, abstractNote={There is an increasing presence of wireless LAN devices in the ISM band. Co-located operation of these devices causes mutual interference and performance degradation. This paper presents experimental results of interference measurements between sample Bluetooth and IEEE 802.11b DS-SS devices.}, number={54ND}, journal={IEEE Vehicular Technology Conference}, author={Punnoose, R.J. and Tseng, R.S. and Stancil, D.D.}, year={2001}, pages={67–71} }
 @article{chen_zhai_stancil_schlesinger_2001, title={Fabrication of Very Small Aperture Laser (VSAL) from a Commercial Edge Emitting Laser}, volume={40}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0035267301&partnerID=MN8TOARS}, number={3 B}, journal={Japanese Journal of Applied Physics, Part 2: Letters}, author={Chen, F. and Zhai, J. and Stancil, D.D. and Schlesinger, T.E.}, year={2001}, pages={1794–1795} }
 @inproceedings{stancil_tonguz_xhafa_cepni_nikitin_brodtkorb_2001, title={High-speed internet access via HVAC ducts: A new approach}, volume={6}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0035694033&partnerID=MN8TOARS}, booktitle={Conference Record / IEEE Global Telecommunications Conference}, author={Stancil, D.D. and Tonguz, O.K. and Xhafa, A. and Cepni, A. and Nikitin, P. and Brodtkorb, D.}, year={2001}, pages={3604–3607} }
 @inproceedings{punnoose_nikitin_stancil_2000, title={Efficient simulation of Ricean fading within a packet simulator}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0034516301&partnerID=MN8TOARS}, number={52 ND}, booktitle={IEEE Vehicular Technology Conference}, author={Punnoose, Ratish J. and Nikitin, Pavel V. and Stancil, Daniel D.}, year={2000}, pages={764–767} }
 @article{zhai_huang_schroeck_messner_stancil_schlesinger_2000, title={High bandwidth electro-optic scanner for optical data storage}, volume={39}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0033879857&partnerID=MN8TOARS}, number={2 B}, journal={Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers}, author={Zhai, J. and Huang, Y. and Schroeck, S. and Messner, W. and Stancil, D.D. and Schlesinger, T.E.}, year={2000}, pages={883–887} }
 @article{prabhakar_stancil_2000, title={Information dimension analysis of chaotic forward volume spin waves in a yttrium–iron–garnet thin film}, volume={87}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-5244334767&partnerID=MN8TOARS}, DOI={10.1063/1.373258}, abstractNote={Forward volume spin waves were excited in a yttrium–iron–garnet film using a microstrip delay line. Low frequency modulations in output power were captured on a digital oscilloscope for various combinations of microwave input frequency and power. Using the decrease in mutual information as a criterion, an embedding delay time was chosen for each time series. The method of false nearest neighbors was then used to calculate a minimal embedding dimension, D. Despite large changes in input frequency (4.4 GHz<f<4.6 GHz) and power (15.7 dBm<P<22.7 dBm), D⩽3 for each time series, indicating a low dimensional system. Finally, the information dimension, d, was estimated by computing the distance from a collection of reference points to their nearest neighbors. The distribution for d was found to be bimodal. When correlated with the input microwave power and frequency, it was found that values of d<2 occurred close to the auto-oscillation threshold in the vicinity of an even dipole gap. d<3 was observed at higher power levels or at frequencies close to an odd dipole gap.}, number={9}, journal={Journal of Applied Physics}, author={Prabhakar, A. and Stancil, D.D.}, year={2000}, pages={5091–5093} }
 @inproceedings{rausch_bain_stancil_schlesinger_2000, title={Near field hybrid recording with a mode index waveguide lens}, volume={4090}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0033652324&partnerID=MN8TOARS}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Rausch, Tim and Bain, James A. and Stancil, Daniel D. and Schlesinger, Tuviah E.}, year={2000}, pages={66–71} }
 @inproceedings{itagi_schlesinger_stancil_2000, title={Numerical simulation of dynamic thermo-magnetic switching and the optical signal in magnetic super-resolution read-out}, volume={4090}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0033645373&partnerID=MN8TOARS}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Itagi, Amit and Schlesinger, T.E. and Stancil, D.D.}, year={2000}, pages={82–93} }
 @article{guo_schlesinger_stancil_2000, title={Optical field study of near-field optical recording with a solid immersion lens}, volume={39}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0000419025&partnerID=MN8TOARS}, number={2}, journal={Applied Optics}, author={Guo, F. and Schlesinger, T.E. and Stancil, D.D.}, year={2000}, pages={324–332} }
 @inproceedings{karns_zhai_herget_song_gamble_stancil_kumar_schlesinger_2000, title={To 100 Gb/in <sup>2</sup> and beyond in magneto-optic recording}, volume={4090}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0033650813&partnerID=MN8TOARS}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Karns, D. and Zhai, J. and Herget, P. and Song, H. and Gamble, A. and Stancil, D.D. and Kumar, B.V.K.Vijaya and Schlesinger, T.E.}, year={2000}, pages={238–245} }
 @inproceedings{gong_messner_schlesinger_shragai_stancil_zhai_2000, title={Ultra-high performance optical servo system using an electrooptic beam scanner}, volume={4090}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0033652928&partnerID=MN8TOARS}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Gong, Bo and Messner, William and Schlesinger, T.E. and Shragai, Hadas and Stancil, Dan and Zhai, JinHui}, year={2000}, pages={335–339} }
 @inproceedings{zhai_huang_schroeck_messner_schlesinger_stancil_1999, title={Electro-optic scanner for an optical head fine actuator}, volume={3864}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0033329635&partnerID=MN8TOARS}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Zhai, Jinhui and Huang, Yuhong and Schroeck, Steve and Messner, W. and Schlesinger, T.E. and Stancil, Daniel D.}, year={1999}, pages={252–254} }
 @inproceedings{zhai_schroeck_huang_messner_stancil_schlesinger_1999, title={Electro-optic scanner for optical disk fine tracking system}, volume={3787}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0033365968&partnerID=MN8TOARS}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Zhai, Jinhui and Schroeck, Steve and Huang, Yuhong and Messner, William and Stancil, Daniel D. and Schlesinger, T.E.}, year={1999}, pages={194–201} }
 @inproceedings{gopalan_itagi_gerstl_swart_jia_mitchell_schlesinger_stancil_1999, title={Ferroelectric domain kinetics in congruent LiTaO<inf>3</inf>}, volume={27}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0033311604&partnerID=MN8TOARS}, DOI={10.1080/10584589908228463}, abstractNote={Abstract We present real-time studies of nucleation and growth of 180° ferroelectric domains in congruent LiTaO3 under an external electric field using optical microscopy. The measured wall velocities are an order of magnitude higher than those reported before using ex-situ techniques. Merger of growing domains form serrated fronts which show a futher order of magnitude increase in wall velocity. A time dependent velocity is required in the Avrami theory to explain the change in domain area versus time at a constant electric field. We believe that these features of domain switching must be considered when studying ferroelectrics in general.}, number={1}, booktitle={Integrated Ferroelectrics}, author={Gopalan, V. and Itagi, A. and Gerstl, S. and Swart, P. and Jia, Q.X. and Mitchell, T.E. and Schlesinger, T.E. and Stancil, D.D.}, year={1999}, pages={137–146} }
 @inproceedings{messner_schlesinger_stancil_1999, title={Improved position and velocity encoder resolution using an electrooptic beam scanner}, volume={3787}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0033360027&partnerID=MN8TOARS}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Messner, William C. and Schlesinger, T.E. and Stancil, Daniel}, year={1999}, pages={202–209} }
 @article{chiu_gopalan_kawas_schlesinger_stancil_risk_1999, title={Integrated Optical Device with Second-Harmonic Generator, Electrooptic Lens, and Electrooptic Scanner in LiTaO<inf>3</inf>}, volume={17}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0033096589&partnerID=MN8TOARS}, DOI={10.1109/50.749386}, abstractNote={This paper reports the first demonstration of an integrated optical device in z-cut LiTaO/sub 3/ that contains the following three functional parts: a quasiphase-matched second-harmonic generation (SHG) grating, an electrooptic (EO) lens, and an electrooptic scanner. The SHG device consists of channel waveguides passing through periodic domain-inverted gratings. The frequency of the input infrared (IR) light at 864 nm was doubled into blue light at 432 nm. A stack of EO lenses was used to collimate the light from the channel waveguide. The measured beam size at the output facet for various applied voltages to the lenses agreed with simulation. After collimation, light passes through an EO scanner that controls the angle of the output beam. A scanning sensitivity of 17 mrad/kV was measured for the scanner, compared to the calculated value of 15 mrad/kV.}, number={3}, journal={Journal of Lightwave Technology}, author={Chiu, Y. and Gopalan, V. and Kawas, M.J. and Schlesinger, T.E. and Stancil, D.D. and Risk, W.P.}, year={1999}, pages={462–464} }
 @article{gahagan_gopalan_robinson_jia_mitchell_kawas_schlesinger_stancil_1999, title={Integrated electro-optic lens/scanner in a LiTaO<inf>3</inf> single crystal}, volume={38}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0001385588&partnerID=MN8TOARS}, DOI={10.1364/AO.38.001186}, abstractNote={We report what we believe to be the first stand-alone integrated electro-optic lens and scanner fabricated on a single crystal of Z-cut LiTaO(3). The independently controlled lens and scanner components consist of lithographically defined domain-inverted regions extending through the thickness of the crystal. A lens power of 0.233 cm(-1) kV(-1) and a deflection angle of 12.68 mrad kV(-1) were observed at the output of the device.}, number={7}, journal={Applied Optics}, author={Gahagan, K.T. and Gopalan, V. and Robinson, J.M. and Jia, Q.X. and Mitchell, T.E. and Kawas, M.J. and Schlesinger, T.E. and Stancil, D.D.}, year={1999}, pages={1186–1190} }
 @article{gopalan_gahagan_kawas_jia_robinson_mitchell_schlesinger_stancil_1999, title={Integration of electro-optic lenses and scanners on ferroelectric LiTaO<inf>3</inf>}, volume={25}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0033315129&partnerID=MN8TOARS}, DOI={10.1080/10584589908210157}, abstractNote={Abstract An integrated electro-optic lens/scanner device was fabricated on ferroelectric LiTaO3 wafer. This was done using lithographically defined domain-inverted regions extending through the crystal thickness. A lens power of 0.233 cm−1kV−1 and a scanner deflection of 12.68 mrad−1 kV−1 was observed. We also demonstrate an electro-optic lens stack collimator which collimates an input beam focused to 5μm waist diameter at 2.3kV.}, number={1-4}, journal={Integrated Ferroelectrics}, author={Gopalan, V. and Gahagan, K.T. and Kawas, M. and Jia, Q.X. and Robinson, J.M. and Mitchell, T.E. and Schlesinger, T.E. and Stancil, D.D.}, year={1999}, pages={31–36} }
 @article{gopalan_gerstl_itagi_mitchell_jia_schlesinger_stancil_1999, title={Mobility of 180° domain walls in congruent LiTaO<inf>3</inf> measured using real-time electro-optic imaging microscopy}, volume={86}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0037637379&partnerID=MN8TOARS}, DOI={10.1063/1.370940}, abstractNote={We report the electric-field dependence of 180° domain-wall mobility in congruent LiTaO3 measured at room temperature using in situ electro-optic imaging microscopy. The measured sideways domain-wall velocity of serrated domain fronts formed upon merger of domains was an order of magnitude larger than that for independently growing domains. The wall velocities also show a strong dependence on the nature of the applied electric field, being an order of magnitude larger for steady-state voltages as compared to pulsed voltage measurements. This is shown to be due to wall stabilization between applied voltage pulses resulting in an inertial delay in moving a domain wall which has been at rest for many seconds.}, number={3}, journal={Journal of Applied Physics}, author={Gopalan, V. and Gerstl, S.S.A. and Itagi, A. and Mitchell, T.E. and Jia, Q.X. and Schlesinger, T.E. and Stancil, D.D.}, year={1999}, pages={1638–1646} }
 @article{prabhakar_stancil_1999, title={Nonlinear microwave-magnetic resonator operated as a bistable device}, volume={85}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0032613991&partnerID=MN8TOARS}, number={8 II A}, journal={Journal of Applied Physics}, author={Prabhakar, A. and Stancil, D.D.}, year={1999}, pages={4859–4861} }
 @inproceedings{guo_schlesinger_stancil_1999, title={Optical field study in solid immersion lens}, volume={3864}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0033322373&partnerID=MN8TOARS}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Guo, Feng and Schlesinger, T.E. and Stancil, D.D.}, year={1999}, pages={255–257} }
 @article{chiu_zou_stancil_schlesinger_1999, title={Shape-optimized electrooptic beam scanners: Analysis, design, and simulation}, volume={17}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0032761262&partnerID=MN8TOARS}, DOI={10.1109/50.737429}, abstractNote={This paper presents the analysis of a general nonrectangular electrooptic (EO) scanner and compare its performance to a rectangular device. Since the scanning sensitivity of an EO scanner is inversely proportional to its width, high sensitivity requires the device contour to be close to the ray trajectory of a beam propagating through the device. Accordingly, a shaped-optimized scanner is designed so that the beam trajectory at maximum deflection is parallel to the device contour. A beam propagation method (BPM) simulation shows the performance agrees well with the analysis.}, number={1}, journal={Journal of Lightwave Technology}, author={Chiu, Y. and Zou, J. and Stancil, D.D. and Schlesinger, T.E.}, year={1999}, pages={108–113} }
 @article{prabhakar_stancil_1998, title={Auto-oscillation thresholds at the main resonance in ferrimagnetic films}, volume={57}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0542369957&partnerID=MN8TOARS}, number={18}, journal={Physical Review B - Condensed Matter and Materials Physics}, author={Prabhakar, A. and Stancil, D.D.}, year={1998}, pages={11483–11491} }
 @article{gopalan_mitchell_jia_robinson_kawas_schlesinger_stancil_1998, title={Ferroelectrics as a versatile solid state platform for integrated optics}, volume={22}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0032320893&partnerID=MN8TOARS}, DOI={10.1080/10584589808208066}, abstractNote={Abstract A high speed electro-optic scanner is demonstrated on a ferroelectric LiTaO3 crystal. The scanner shows a deflection of 39.5 mrad/kV, 13 resolvable spots per kV, and shows no degradation of performance upto 10MHz of driving field. Integration of the scanner with quasi-phase-matched frequency doublers and lenses is discussed.}, number={1-4}, journal={Integrated Ferroelectrics}, author={Gopalan, V. and Mitchell, T.E. and Jia, Q.X. and Robinson, J.M. and Kawas, M. and Schlesinger, T.E. and Stancil, D.D.}, year={1998}, pages={465–471} }
 @article{kawas_stancil_schlesinger_gopalan_1997, title={Electrooptic lens stacks on LiTaO <inf>3</inf> by domain inversion}, volume={15}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0031236670&partnerID=MN8TOARS}, DOI={10.1109/50.622899}, abstractNote={The design and analysis of one-dimensional (1-D) electrooptic lens stacks is presented. Experimental results of a seven-element stack fabricated on Z-cut LiTaO/sub 3/ substrates using domain inversion support the analysis. The optical focusing power of these bulk stacks is shown to be voltage-controlled.}, number={9}, journal={Journal of Lightwave Technology}, author={Kawas, M.J. and Stancil, D.D. and Schlesinger, T.E. and Gopalan, V.}, year={1997}, pages={1716–1719} }
 @article{prabhakar_stancil_1997, title={Quadratic power corrections to the dynamic magnetization using the transverse magnetostatic wave-optical interaction}, volume={81}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-4143070525&partnerID=MN8TOARS}, number={6}, journal={Journal of Applied Physics}, author={Prabhakar, A. and Stancil, D.D.}, year={1997}, pages={2730–2735} }
 @article{prabhakar_stancil_1997, title={Wideband optical modulation via the magneto-optic interaction in a bismuth-Iutetium-iron garnet film}, volume={71}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0031185509&partnerID=MN8TOARS}, number={2}, journal={Applied Physics Letters}, author={Prabhakar, A. and Stancil, D.D.}, year={1997}, pages={151–153} }
 @article{prabhakar_stancil_1996, title={Effects of high microwave power on collinear magnetostatic-optical wave interactions}, volume={32}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0030143006&partnerID=MN8TOARS}, DOI={10.1109/20.492887}, abstractNote={In the collinear interaction between magnetostatic waves and optical guided modes, the use of high microwave power is experimentally observed to broaden the range of microwave frequencies over which a significant optical mode conversion occurs. A mechanism contributing to this broadening is described that is based on a nonlinear shift in the wavelength of the magnetostatic waves at high power along with magnetic damping. Comparisons between previous experiments and our theoretical predictions show that this mechanism can explain some, but not all, of the changes observed in the optical spectrum at high microwave power levels.}, number={3 PART 2}, journal={IEEE Transactions on Magnetics}, author={Prabhakar, A. and Stancil, D.D.}, year={1996}, pages={1918–1923} }
 @article{chiu_stancil_schlesinger_risk_1996, title={Electro-optic beam scanner in KTiOPO<inf>4</inf>}, volume={69}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0030288108&partnerID=MN8TOARS}, DOI={10.1063/1.116806}, abstractNote={We have fabricated and demonstrated both wafer and waveguide electro-optic beam scanners in KTiOPO4 using alternating domain-inverted triangular patterns in the substrate. This device is an extension of previous work in LiTaO3. The domain inversion was achieved by pulsed electric field poling. The deflection sensitivity was 2.1 mrad/kV, compared to the calculated value of 2.3 mrad/kV for this geometry. The bandwidth of the devices was measured to be at least 200 kHz, which was limited by the high voltage driver.}, number={21}, journal={Applied Physics Letters}, author={Chiu, Y. and Stancil, D.D. and Schlesinger, T.E. and Risk, W.P.}, year={1996}, pages={3134–3136} }
 @inproceedings{li_cheng_kawas_lambeth_schlesinger_stancil_1996, title={Electro-optic wafer beam deflector in LiTaO3}, volume={2700}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0029766681&partnerID=MN8TOARS}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Li, Jun and Cheng, Hsing C. and Kawas, Matthew J. and Lambeth, David N. and Schlesinger, Tuviah E. and Stancil, Daniel D.}, year={1996}, pages={73–77} }
 @article{li_cheng_kawas_lambeth_schlesinger_stancil_1996, title={Electrooptic wafer beam deflector in LiTaO<inf>3</inf>}, volume={8}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0030286498&partnerID=MN8TOARS}, DOI={10.1109/68.541558}, abstractNote={A novel electrooptic beam deflector is reported based on ferroelectric domain inversion extending through the thickness of a Z-cut LiTaO/sub 3/ wafer. The selective domain inversion is achieved by electric-field poling assisted by proton exchange, rather than proton exchange followed by rapid thermal annealing. The deflection sensitivity of the device was measured to be 5.0 mrad/KV. This is 93% of the theoretical value for this geometry, and a significant improvement over the value of 80% of theoretical previously reported for a waveguide deflector. This improvement is attributed to the new domain inversion process. No degradation of deflection sensitivity is observed up to the frequency of 300 KHz, which is then limited by the response time of detectors.}, number={11}, journal={IEEE Photonics Technology Letters}, author={Li, J. and Cheng, H.C. and Kawas, M.J. and Lambeth, D.N. and Schlesinger, T.E. and Stancil, D.D.}, year={1996}, pages={1486–1488} }
 @article{gopalan_kawas_gupta_schlesinger_stancil_1996, title={Integrated quasi-phase-matched second-harmonic generator and electrooptic scanner on LiTaO<inf>3</inf> single crystals}, volume={8}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0030387468&partnerID=MN8TOARS}, DOI={10.1109/68.544725}, abstractNote={We report the first integrated quasi-phase-matched second-harmonic generator and electrooptic scanner on ferroelectric Z-cut LiTaO/sub 3/. The quasi-phase-matched second-harmonic generation device frequency doubles the infrared light at 829.7 nm into blue at 414.85 nm with a bulk conversion efficiency of 0.52%/W-cm. The blue light generated in the bulk then passes through an electrooptic scanner, consisting of a series of lithographically defined triangular-shaped domain-inverted regions extending through the thickness of the crystal. A deflection of 12 mrad/kv for the output blue light and 7.4 mrad/kv for the infrared light was observed at the scanner output.}, number={12}, journal={IEEE Photonics Technology Letters}, author={Gopalan, V. and Kawas, M.J. and Gupta, M.C. and Schlesinger, T.E. and Stancil, D.D.}, year={1996}, pages={1704–1706} }
 @article{stancil_1996, title={Kronig—Penney model for periodically segmented waveguides}, volume={35}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0030212762&partnerID=MN8TOARS}, DOI={10.1364/AO.35.004767}, abstractNote={Physical insight into the propagation characteristics of periodically segmented waveguides can be obtained by viewing the guiding layer as a thin slab of an idealized infinite medium with periodic layers along the direction of propagation. One can analyze the properties of this infinite medium using a formal analogy with the Kronig-Penney model used to describe the propagation of electron wave functions in a periodic crystal potential. The model correctly gives the effective refractive index of the layer, gives insight into the electric field profiles at different points on the dispersion curve, and leads to a qualitative explanation of why the optical loss diminishes at both large and small duty cycles.}, number={24}, journal={Applied Optics}, author={Stancil, D.D.}, year={1996}, pages={4767–4771} }
 @inproceedings{chiu_stancil_schlesinger_1996, title={Large electro-optic coefficient observed in ion-exchanged potassium titanyl phosphate waveguides}, volume={2700}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0029766682&partnerID=MN8TOARS}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Chiu, Yi and Stancil, Daniel D. and Schlesinger, Tuviah E.}, year={1996}, pages={164–169} }
 @article{chiu_stancil_schlesinger_1996, title={Large electro-optic modulation effect observed in ion-exchanged KTiOPO<inf>4</inf> waveguides}, volume={80}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0030270868&partnerID=MN8TOARS}, DOI={10.1063/1.363313}, abstractNote={We report the observation of an anomalously large electro-optic modulation effect in potassium titanyl phosphate (KTiOPO4) waveguides fabricated under various conditions. An interferometric method was used to measure the effective electro-optic coefficient in the waveguides by measuring the phase retardation of an optical mode when a voltage was applied across the substrate. We observed that at low modulation frequency the effective electro-optic coefficient in the waveguides can be higher than the bulk value by a factor up to about 100. A space charge model relating the mobile charge, space charge field, and observed enhancement in the electro-optic modulation is proposed to explain the mechanism of this effect. Calculation for dc steady state, small signal analysis, and large signal simulation is compared to the experimental observation. Possible device application and long term effects on system operation are also discussed.}, number={7}, journal={Journal of Applied Physics}, author={Chiu, Y. and Stancil, D.D. and Schlesinger, T.E.}, year={1996}, pages={3662–3667} }
 @article{cash_stancil_1996, title={Measurement of magnetostatic wave profiles using the interaction with transverse optical guided waves}, volume={32}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0030246268&partnerID=MN8TOARS}, DOI={10.1109/20.538621}, abstractNote={The profile of magnetostatic forward volume waves along the direction of propagation is measured using the transverse interaction with optical guided modes. The technique is used in regimes of both linear and nonlinear magnetostatic wave excitation. A microwave input power of up to 700 mW in the frequency range of 6-8 GHz was used to excite magnetostatic waves in a 6.3 /spl mu/m film of (BiLu)/sub 3/Fe/sub 5/O/sub 12/. The optical wavelength used in the experiment was 1.32 /spl mu/m. At distances beyond about 1 min from the transducer, we observed an approximately exponential decay with a rate of about 40 dB/cm. The profile departs from an exponential shape at distances closer than 1 mm, owing, we believe, to transducer fringing field effects and the finite resolution of the probe beam. The nonlinear microwave frequency shift of the interaction spectrum was also observed at high magnetostatic wave power levels.}, number={5 PART 3}, journal={IEEE Transactions on Magnetics}, author={Cash, A.F. and Stancil, D.D.}, year={1996}, pages={5188–5192} }
 @inproceedings{tan_zou_stancil_schlesinger_migliuolo_1996, title={Sputter-deposited c-axis-oriented LiNbO3 thin films on silicon}, volume={2700}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0029767773&partnerID=MN8TOARS}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Tan, Songshen and Zou, J. and Stancil, Daniel D. and Schlesinger, Tuviah E. and Migliuolo, Michele}, year={1996}, pages={170–177} }
 @article{prabhakar_stancil_1996, title={Variations in auto-oscillation frequency at the main resonance in rectangular yttrium-iron-garnet films}, volume={79}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0038426724&partnerID=MN8TOARS}, number={8 PART 2A}, journal={Journal of Applied Physics}, author={Prabhakar, A. and Stancil, D.D.}, year={1996}, pages={5374–5376} }
 @article{prabhakar_stancil_1996, title={Variations in the magneto-optic coupling coefficient in a bismuth-lutetium-iron-garnet film}, volume={32}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0030246335&partnerID=MN8TOARS}, DOI={10.1109/20.539328}, abstractNote={Magnetostatic wave-optical interactions are studied in the transverse geometry using a [BiLu]/sub 3/Fe/sub 5/O/sub 12/ film. Non-monotonic variations in the magneto-optic coupling coefficient are observed as we increase the input microwave power at a fixed frequency. Similar variations are also seen in the transmitted microwave signal, though the features appear at higher power levels. The non-monotonic behavior is due to a shift in the microwave passband with increasing power. Density plots are used to correlate the two sets of data over a 350 MHz region. The discrepancy in power levels associated with a feature in the line plots is a consequence of the different curvatures of the two density plots.}, number={5 PART 1}, journal={IEEE Transactions on Magnetics}, author={Prabhakar, A. and Stancil, D.D.}, year={1996}, pages={4174–4176} }
 @article{le_huang_stancil_lambeth_1995, title={Bismuth substituted iron garnet thin films deposited on silicon by laser ablation}, volume={77}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0005293616&partnerID=MN8TOARS}, DOI={10.1063/1.358789}, abstractNote={Thin films of bismuth substituted iron garnet are fabricated on silicon (100) substrates using the pulsed laser deposition technique. There is a narrow temperature range in which good polycrystalline garnet films can be grown on silicon; it must be higher than 575 °C for the films to crystallize and lower than 700 °C to avoid chemical reaction between the silicon substrate and the deposited materials. Film microstructure and magnetic properties are compared for films grown at different growth conditions and annealing procedures. The films heated during deposition are smooth and dense in contrast to the post-annealed films, which are characterized by clusters of many smaller grains separated by large cracks and a very small coercivity.}, number={5}, journal={Journal of Applied Physics}, author={Le, T.M. and Huang, F. and Stancil, D.D. and Lambeth, D.N.}, year={1995}, pages={2128–2132} }
 @article{schlesinger_chiu_stancil_burton_1995, title={Design and Simulation of Waveguide Electrooptic Beam Deflectors}, volume={13}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0029388840&partnerID=MN8TOARS}, DOI={10.1109/50.469729}, abstractNote={Numerical simulation based on the scalar beam propagation method, was used to investigate the performance of waveguide electrooptic beam deflectors. The deflectors under investigation consist of a stack of electrooptically controlled prisms in a waveguide. The results were compared to earlier simplified analysis. It was found that for given overall device dimensions, the number of interfaces between prisms in a prism-type electrooptic deflector has significant influence on the device performance when it is small. To avoid wavefront distortion, unwanted reflection from the interfaces, and asymmetry in the deflection angles caused by small number of interfaces, one should use more than about ten interfaces in a typical deflector. Additional insights of device operation and design issues are discussed. >}, number={10}, journal={Journal of Lightwave Technology}, author={Schlesinger, T.E. and Chiu, Y. and Stancil, D.D. and Burton, R.S.}, year={1995}, pages={2049–2052} }
 @article{huang_wolfgang_le_lambeth_stancil_1995, title={Oxygen Pressure Dependence of Laser Deposited Barium Ferrite Films on LLC(111)}, volume={31}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0029409401&partnerID=MN8TOARS}, DOI={10.1109/20.489785}, abstractNote={Hexagonal Barium Ferrite thin films with perpendicular anisotropy were successfully fabricated on the (111) surface of large lattice constant (LLC) garnet substrates using pulsed laser deposition. Oxygen pressure plays a crucial role in determining film growth characteristics. The film grown at 50 mTorr oxygen pressure has a clear hexagonal structure but is very weakly crystallized due to the lack of oxygen. Increasing the oxygen pressure enhances both crystallization and the in-plane c-axis oriented crystal growth, hence it reduces the perpendicular anisotropy. The optimum pressure is about 180 mTorr which gives a crystallized film with predominantly perpendicular c-axis orientation. The sensitive dependence of film structure on processing gas pressure shown in this work is important in controlling film properties such as anisotropy and grain size for different applications.}, number={6}, journal={IEEE Transactions on Magnetics}, author={Huang, F. and Wolfgang, J.J. and Le, T.M. and Lambeth, D.N. and Stancil, D.D.}, year={1995}, pages={3826–3828} }
 @article{cho_santhanam_le_mountfield_lambeth_stancil_ross_lucas_1994, title={Design, fabrication, switching, and optical characteristics of new magneto-optic spatial light modulator}, volume={76}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0028493190&partnerID=MN8TOARS}, DOI={10.1063/1.357673}, abstractNote={A new reflected mode magneto-optic spatial light modulator (R-MOSLM) has been developed for miniature optical correlators and computers. A factor of 4 improvement in pixel switching sensitivity, compared to the conventional transmission mode magneto-optic spatial light modulator, has been achieved by the use of narrower drive lines, and burying the conductor into the film. A factor of 3 higher resolution and a factor of 2 higher optical efficiency have also been achieved by the use of smaller pixels and narrower pixel gaps. The smaller pixels and improved switching sensitivity permit an order of magnitude reduction in optical path length and increase in frame rate, respectively. The progress that has been made in the design of the R-MOSLM, issues concerning its fabrication, a comparison by finite element analysis of field modeling to experimentally determined current requirements to drive individual lines, and some optical characteristics are discussed.}, number={3}, journal={Journal of Applied Physics}, author={Cho, J. and Santhanam, S. and Le, T. and Mountfield, K. and Lambeth, D.N. and Stancil, D. and Ross, W.E. and Lucas, J.}, year={1994}, pages={1910–1919} }
 @article{chen_chiu_lambeth_schlesinger_stancil_1994, title={Guided-Wave Electro-Optic Beam Deflector Using Domain Reversal in LiTaO3}, volume={12}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0028481982&partnerID=MN8TOARS}, DOI={10.1109/50.317528}, abstractNote={We have fabricated and demonstrated the operation of electro-optic beam deflectors using domain reversal in planar waveguides fabricated on LiTaO/sub 3/ substrates. The planar waveguides were made using proton exchange on z-cut substrates, and proton exchange with subsequent rapid thermal annealing was used to form the inverted domains. The deflection sensitivity of the device was measured to be about 6.7 mrad/kV. Calculations indicate that the deflection sensitivity should be increased by a factor of 25 to 30 with improvements in device geometry. >}, number={8}, journal={Journal of Lightwave Technology}, author={Chen, Q. and Chiu, Y. and Lambeth, D.N. and Schlesinger, T.E. and Stancil, D.D.}, year={1994}, pages={1401–1404} }
 @article{chen_stancil_1994, title={Identification and quantitative characterization of antiparallel domains using an interferometric method}, volume={33}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0028545270&partnerID=MN8TOARS}, number={31}, journal={Applied Optics}, author={Chen, Qibiao and Stancil, D.D.}, year={1994}, pages={7496–7500} }
 @inproceedings{devasahayam_lambeth_schlesinger_stancil_1994, title={Laser ablation for deep etching}, volume={8}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0028089611&partnerID=MN8TOARS}, booktitle={Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting}, author={Devasahayam, A.J. and Lambeth, D.N. and Schlesinger, T.E. and Stancil, D.D.}, year={1994}, pages={393–394} }
 @article{chernakova_stancil_1994, title={Low Energy Ion Bombardment and Surface Spin Pinning in Yttrium Iron Garnet Films}, volume={30}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0028550433&partnerID=MN8TOARS}, DOI={10.1109/20.334138}, abstractNote={Surface spin pinning and physical and chemical changes on the surface of yttrium iron garnet crystalline films were investigated. The magnetic properties of these films as determined by magnetostatic surface waves and ferromagnetic resonance measurements were studied as functions of Ar ion energy E/sub i/=200-1000 eV and ion dose D/sub i/=10/sup 14/-10/sup 18/ ions/cm/sup 2/. The surface spin pinning appears in a mildly damaged, non-stoichiometric layer with oxygen depletion. An alternative mechanism for the surface spin pinning effect based on an anisotropy associated with the oxygen vacancies and iron ion valence changes is proposed. >}, number={6}, journal={IEEE Transactions on Magnetics}, author={Chernakova, A.K. and Stancil, D.D.}, year={1994}, pages={4530–4532} }
 @inproceedings{measured characteristics of the reflected magneto-optic spatial light modulator (r-moslm tm) device_1994, volume={2240}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0028738093&partnerID=MN8TOARS}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, year={1994}, pages={292–298} }
 @article{chernakova_cash_peruyero_stancil_1994, title={Orientation dependence of dipole gaps in the magnetostatic wave spectrum of Bi-substituted iron garnets}, volume={75}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0542415081&partnerID=MN8TOARS}, DOI={10.1063/1.355459}, abstractNote={The orientation dependence of the dipole-exchange gaps in the magnetostatic forward volume wave spectrum of Bi0.8Lu2.2Fe5O12 thin films grown from a Bi-oxide flux has been studied. The spectrum is relatively insensitive to tilting the bias field toward the direction of propagation, but significant improvements are observed when the field is tilted toward a direction perpendicular to the propagation direction. Improvements include smoothing of the dipole-exchange gaps and a reduction of the insertion loss. These improvements are nonreciprocal; either reversing the direction of propagation or tilting the bias field in the opposite direction degrades the forward volume wave spectrum.}, number={10}, journal={Journal of Applied Physics}, author={Chernakova, A.K. and Cash, A. and Peruyero, J. and Stancil, D.D.}, year={1994}, pages={6066–6068} }
 @article{huang_le_lambeth_stancil_1994, title={The effect of in situ laser annealing on laser ablation deposited garnet films}, volume={21}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0028735414&partnerID=MN8TOARS}, DOI={10.1016/0167-577X(94)90242-9}, abstractNote={We have studied the influence of in situ laser annealing on the growth of garnet films by pulsed laser deposition. The KrF excimer laser that is used for ablation also provides in situ laser irradiation to the film with an energy density in the range 60–130 mJ/cm2. Results show that laser annealing helps crystallize the film and affects the film microstructure dramatically depending upon the annealing laser fluence. When using a substrate temperature of 570°C, a laser irradiation at a low fluence of 60 mJ/cm2 induces crystallization and the film consists of densely packed grains. At 100 mJ/cm2, the film is partially melted resulting in a very smooth film surface and a decrease in crystallization. Ablation starts to occur at an energy density of 130 mJ/cm2 for these garnet films. We also show that such laser annealing does not lead to a significant reduction in the required substrate temperature for crystallization even though the transient temperature rise can be high enough to melt the film.}, number={5-6}, journal={Materials Letters}, author={Huang, F. and Le, T.M. and Lambeth, D.N. and Stancil, D.D.}, year={1994}, pages={365–369} }
 @article{silliman_gualtieri_stancil_1993, title={Improvement of FMR linewidth in Bi-substituted lutetium iron garnet thin films for the MSW-optical-mode interaction}, volume={73}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-13044291855&partnerID=MN8TOARS}, DOI={10.1063/1.352579}, abstractNote={Thin films of bismuth-substituted lutetium iron garnet (BiLuIG) for the magnetostatic wave (MSW)-optical-mode interaction can be grown by liquid-phase epitaxy from the standard PbO-based melt system developed for yttrium iron garnet (YIG). The addition of MgO to the melt to counteract the effect of lea on the ferromagnetic resonance (FMR) linewidth is investigated. BiLuIG thin films were grown on paramagnetic gadolinium gallium garnet substrates with varying amounts of MgO added. The ferromagnetic resonance linewidth, optical waveguide absorption, and MSW passband were measured. The addition of magnesium reduced the FMR linewidth from an average of 3 Oe down to under 1 Oe, with little effect on other parameters.}, number={10}, journal={Journal of Applied Physics}, author={Silliman, S.D. and Gualtieri, D.M. and Stancil, D.D.}, year={1993}, pages={6460–6462} }
 @inproceedings{chiu_burton_stancil_schelsinger_1993, title={Numerical simulation of thin-film electro-optic beam deflectors}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0027850844&partnerID=MN8TOARS}, booktitle={Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting}, author={Chiu, Y. and Burton, R. and Stancil, D.D. and Schelsinger, T.E.}, year={1993}, pages={496–497} }
 @inproceedings{reflected magneto-optic spatial light modulator advanced development for miniature ruggedized optical correlators_1993, volume={1959}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0027843055&partnerID=MN8TOARS}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, year={1993}, pages={222–229} }
 @inproceedings{ross_cho_farmer_lambeth_le_santhanam_stancil_1992, title={Advanced magneto-optic spatial light modulator device development update}, volume={1704}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0026974975&partnerID=MN8TOARS}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Ross, William E. and Cho, Jaekyong and Farmer, Alan and Lambeth, David N. and Le, Tan and Santhanam, Suresh and Stancil, Daniel D.}, year={1992}, pages={222–229} }
 @article{bilaniuk_stancil_1991, title={Dynamic Spatial Variations of the “Unconverted” Exit Beam in the Magnetostatic Wave - Optical Interaction}, volume={27}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0026255427&partnerID=MN8TOARS}, DOI={10.1109/20.278879}, abstractNote={The authors have observed in YIG (yttrium-iron-garnet) an effect apart from the anisotropic MSW (magnetostatic wave) optical collinear interaction which has a much wider bandwidth than the latter: about 500 MHz vs 10 MHz at MSW frequencies between 6 and 7 GHz. A slit placed in front of the detector profiles the film parallel to its width. It is found that the beam has a non-Gaussian component synchronous with the MSW modulation. The shape of this component depends on k/sub MSW/, but there is usually one negative and one positive peak, as if light were being deflected from one part of the beam to another. When the whole beam is focused on the detector, these wideband features cancel, leaving the expected narrow peak associated with the anisotropic interaction. Changes in the profile shape are small as the input MSW power is varied between 2 and 20 dBm. This wideband effect may be due to isotropic MSW-optical interactions, but this is in doubt because the peak spreading does not appear to change with k/sub MSW/ in the unconverted exit beam. >}, number={6}, journal={IEEE Transactions on Magnetics}, author={Bilaniuk, N. and Stancil, D.D.}, year={1991}, pages={5486–5488} }
 @article{ramesh_gualtieri_silliman_peruyero_stancil_1991, title={Effect of sodium doping of rare-earth iron garnet films on magnetic and magneto-optic properties}, volume={70}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0039798610&partnerID=MN8TOARS}, DOI={10.1063/1.349970}, abstractNote={Bismuth-doped lutetium iron garnet (BLIG) is an important material for implementation of the interaction between magnetostatic waves and optical guided modes. Sodium oxide is suggested to reduce the viscosity of the lead-free melt used for liquid-phase epitaxy (LPE) growth of the films, improving flux removal. The effect of the incorporation of sodium into the garnet lattice on the important magnetic and magneto-optic properties is studied, using yttrium iron garnet as a model system. Negligible effect on the Faraday rotation and magnetostatic wave passband is noted. The uniaxial anisotropy field is affected in the negative direction by a growth induced anisotropy due to sodium inclusion, but this effect may be removed by annealing.}, number={10}, journal={Journal of Applied Physics}, author={Ramesh, M. and Gualtieri, D.M. and Silliman, S.D. and Peruyero, J. and Stancil, D.D.}, year={1991}, pages={6289–6291} }
 @inproceedings{opsasnick_stancil_white_tsai_1991, title={Optical fibers for magneto-optical recording}, volume={1499}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0026382010&partnerID=MN8TOARS}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Opsasnick, Michael N. and Stancil, Daniel D. and White, Sean T. and Tsai, Ming-Horn}, year={1991}, pages={276–280} }
 @article{stancil_1991, title={Optical-Magnetostatic Wave Coupled-Mode Interactions in Garnet Heterostructures}, volume={27}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0025792334&partnerID=MN8TOARS}, DOI={10.1109/3.73542}, abstractNote={Optical-magnetostatic wave coupling is considered theoretically in a five-layer structure consisting of three thin films, a cover, and a substrate. Two of the thin films are magnetic and are optimized separately for microwave and optical properties. The optical mode analysis permits the layers to be anisotropic provided the permittivity tensor is diagonal in the problem coordinate system. The magnetooptical properties are treated as a perturbation. Both Faraday and Cotton-Mouton effects are included. Coupled-mode theory is applied to the optical modes in this geometry for the general case of noncollinear propagation. The extra degrees of freedom provided by two magnetic films make it possible to adjust the microwave parameters so that the operating point is near the susceptibility resonance of the optical guiding layer, thereby enhancing the magnetic response of this layer. >}, number={1}, journal={IEEE Journal of Quantum Electronics}, author={Stancil, D.D.}, year={1991}, pages={61–70} }
 @article{bilaniuk_stancil_talisa_1990, title={An optical frequency shifter using magnetostatic waves}, volume={67}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0000267102&partnerID=MN8TOARS}, DOI={10.1063/1.345234}, abstractNote={The optical frequency shift in the collinear magnetostatic wave–optical guided mode interaction has been observed by directly measuring the change in optical wavelength due to magnetostatic waves in the 2–12 GHz range. The experimental shift is found to be in good agreement with the theoretically predicted value of 0.058 Å/GHz at λ0=1.319 μm.}, number={1}, journal={Journal of Applied Physics}, author={Bilaniuk, N. and Stancil, D.D. and Talisa, S.H.}, year={1990}, pages={508–510} }
 @article{bilaniuk_stancil_1990, title={Evidence for acoustic-wave coupling in the magnetostatic-wave-optical interaction}, volume={67}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-36549100906&partnerID=MN8TOARS}, DOI={10.1063/1.344788}, abstractNote={We have observed the collinear interaction between optical guided modes and magnetostatic forward-volume waves in a film of yttrium iron garnet (YIG) with microwave frequencies between 500 MHz and 12 GHz. The interaction occurred in one of two 5.3-μm films of YIG on either side of a 470-μm substrate of gadolinium gallium garnet (GGG). The intensity of the diffracted optical beam was measured as the microwave frequency was swept about the center frequency, with magnetic bias field held constant. We refer to this measurement as the interaction passband. Below 1 GHz, we observed absorption notches in the interaction passband with a regular period of 3.7 MHz. These are interpreted as evidence of coupling to transverse acoustic resonances through the sample thickness. This spacing agrees with a simple calculation based on transverse acoustic velocities in YIG of 3843 m/s and GGG of 3568 m/s.}, number={9}, journal={Journal of Applied Physics}, author={Bilaniuk, N. and Stancil, D.D.}, year={1990}, pages={4790–4792} }
 @article{koros_bilaniuk_stancil_1990, title={Linear motion sensor using the Doppler effect with magnetostatic waves}, volume={67}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33748158143&partnerID=MN8TOARS}, DOI={10.1063/1.345235}, abstractNote={Observation of the Doppler shift of magnetostatic waves and a new linear velocity and position sensor based on this effect are reported. The sensor consists of a magnetostatic surface-wave delay line in which one transducer is allowed to move along the direction of propagation. Position and velocity are indicated by the phase and Doppler shift of the transmitted signal, respectively. These effects are much larger than would be observed with ordinary electromagnetic waves at the same frequency owing to the shorter wavelengths of magnetostatic waves.}, number={1}, journal={Journal of Applied Physics}, author={Koros, N.L. and Bilaniuk, N. and Stancil, D.D.}, year={1990}, pages={511–514} }
 @article{talisa_stancil_1989, title={Device possibilities for the MSW-optical collinear interaction}, volume={25}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0024732944&partnerID=MN8TOARS}, DOI={10.1109/20.42346}, abstractNote={Experimental and theoretical results are given which show that desirable requirements for devices can be met by the magnetostatic-wave (MSW)-light collinear interaction. It has been shown experimentally that the interaction can produce narrowband, tunable passbands potentially useful for device functions in microwave filtering and light-wave frequency shifting. Theoretical calculations show a more narrow passband than that observed. To enhance coupling efficiency, the authors propose a multilayered structure with separate optical and microwave guiding layers. Example calculations for this structure show that 100% conversion lengths on the order of 1 cm at both 1.152 mu m and 1.32 mu m should be possible in low-loss films. These structures could be fabricated with present technology. >}, number={5}, journal={IEEE Transactions on Magnetics}, author={Talisa, S.H. and Stancil, D.D.}, year={1989}, pages={3494–3496} }
 @inproceedings{bilaniuk_stancil_1989, title={Effective interaction lengths in the collinear magnetostatic wave - Optical interaction}, volume={1177}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33747934171&partnerID=MN8TOARS}, DOI={10.1117/12.963356}, abstractNote={The collinear magnetostatic wave - optical wave interaction is considered. Emphasis is placed on the effect of magnetostatic and optical losses on the conversion efficiency between optical modes and on the interaction bandwidth. It is found that the introduction of an "effective interaction length" provides a straightforward refinement of existing theory applicable to situations with small total energy transfer between optical modes. A weak-coupling model for the interaction bandwidth in the presence of loss is also described. The utility of the model is tested by comparing experimentally obtained interaction bandwidths against theoretical predictions, at center frequencies between 0.5 and 12 GHz. Taking optical and magnetostatic wave losses into account in the theory results in a significant improvement over lossless coupled-mode theory. Some experimental techniques and applications with magnetostatic waves are illustrated.}, booktitle={Proceedings of SPIE - The International Society for Optical Engineering}, author={Bilaniuk, N. and Stancil, D.D.}, year={1989}, pages={365–372} }
 @article{stancil_1989, title={Theory of Magnetostatic Waves in Moving Ferrite Films and Applications to Rotation Rate Sensing}, volume={37}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0024663243&partnerID=MN8TOARS}, DOI={10.1109/22.17451}, abstractNote={A first-order field theory for electromagnetic waves in moving ferrites and ferrite thin films is presented. The dominant effect of the motion is found to be the Doppler-shifted frequency observed in the moving frame. This gives rise to an anomalously large shift in wavenumber, due to the dispersive nature of the ferrite medium. Because of the large effect, it is suggested that a moving-medium experiment using magnetostatic waves could be used to distinguish between various competing forms for the dispersion term in the Fresnel-Fizeau coefficient. The results of the field theory are discussed with relation to relative and absolute rotation rate sensing. The author describes how magnetostatic waves could be used to measure relative rotation rates if confined to propagate around the perimeter of a rotating disk. Since the phase shift would be established in the time required to propagate around the disk, the response time could be significantly shorter than conventional tachometers. An experiment with counterpropagating magnetostatic waves is suggested to clarify the effect of a magnetic medium on the magnitude of the Sagnac effect. >}, number={5}, journal={IEEE Transactions on Microwave Theory and Techniques}, author={Stancil, D.D.}, year={1989}, pages={851–859} }
 @article{stancil_1989, title={Thin‐film permanent magnet requirements for magnetic devices in MMIC}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0024629171&partnerID=MN8TOARS}, DOI={10.1002/mop.4650020302}, abstractNote={Abstract}, number={3}, journal={Microwave and Optical Technology Letters}, author={Stancil, D.D.}, year={1989}, pages={81–85} }
 @article{stancil_schlesinger_stamper_wong_1988, title={Hysteresis model for polycrystalline high-T<inf>c</inf> superconductors}, volume={64}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-36549102646&partnerID=MN8TOARS}, DOI={10.1063/1.342195}, abstractNote={The hysteresis exhibited by ceramic superconductors can be modeled using a phenomenological critical current density of the form Jc=α/(B0+B) with suitable extensions. At low temperatures (near 4 K), satisfactory results can be obtained using this form and neglecting the equilibrium magnetization. However, we show that at higher temperatures the incorporation of the equilibrium magnetization becomes more important. At 77 K, the commonly observed shape of the curves is dominated by the equilibrium magnetization. An approximate model including the equilibrium magnetization is described and compared to measurements made at 77 K.}, number={10}, journal={Journal of Applied Physics}, author={Stancil, D.D. and Schlesinger, T.E. and Stamper, A.K. and Wong, D.}, year={1988}, pages={5899–5901} }
 @article{wong_stamper_stancil_schlesinger_1988, title={Low-field structure in the magnetization of polycrystalline YBa <inf>2</inf>Cu<inf>3</inf>O<inf>7-x</inf> and ErBa<inf>2</inf>Cu <inf>3</inf>O<inf>7-x</inf>}, volume={53}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0039947189&partnerID=MN8TOARS}, DOI={10.1063/1.100587}, abstractNote={We have studied the structure present at small fields (<50 Oe) in the magnetic hysteresis of polycrystalline samples of YBa2Cu3O7−x and ErBa2Cu3O7−x. This structure is absent from measurements on a powder of YBa2Cu3O7−x. We conclude that the structure results from interactions among the grains and is not an intrinsic property of the compounds. Flux creep associated with this structure is found to be proportional to ln(t) over three decades of observation time.}, number={3}, journal={Applied Physics Letters}, author={Wong, D. and Stamper, A.K. and Stancil, D.D. and Schlesinger, T.E.}, year={1988}, pages={240–242} }
 @article{saunders_stancil_1988, title={Magnetostatic wave ring resonator with a rotating thin film}, volume={24}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0024112435&partnerID=MN8TOARS}, DOI={10.1109/20.92251}, abstractNote={A magnetostatic-wave ring resonator with a rotating thin film has been constructed, and its use as a rotation rate sensor has been investigated. Measurements were made between 1.0 and 1.5 GHz. Large orientation-dependent phase and amplitude variations were observed that masked velocity-dependent effects. The variations are attributed to magnetocrystalline anisotropy and preclude the use of the device as a rotation rate sensor. However, the phase shift through the device was found to vary with temperature at a rate of -9.8 degrees/ degrees C, suggesting that it could be used as a noncontacting temperature sensor for rotating bodies. >}, number={6}, journal={IEEE Transactions on Magnetics}, author={Saunders, A.E. and Stancil, D.D.}, year={1988}, pages={2805–2807} }
 @article{poston_stancil_1987, title={Magnetostatic wave ring resonator exhibiting a single resonance}, volume={61}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-36549095543&partnerID=MN8TOARS}, DOI={10.1063/1.338500}, abstractNote={A magnetostatic surface wave ring resonator is described which employs a new transducer configuration for exciting a single resonant mode. The configuration consists of one three-element grating array and one three-element meander array. The predominant resonance is 10 dB above adjacent resonances and exhibits a loaded Q as high as 890 with 13 dB insertion loss at approximately 1.86 GHz.The device is tunable over the range of 1.5–2.1 GHz, although suppression of unwanted resonances is reduced near the edges of this range.}, number={8}, journal={Journal of Applied Physics}, author={Poston, T.D. and Stancil, D.D.}, year={1987}, pages={4127–4129} }
 @article{buris_stancil_1986, title={Correction to “magnetostatic surface-wave propagation in ferrite thin films with arbitrary variations of the magnetization through the film thickness”}, volume={34}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84939353676&partnerID=MN8TOARS}, DOI={10.1109/TMTT.1986.1133354}, abstractNote={A variational formulation for the magnetostatic problem in an anisotropic and inhomogeneous region bounded by perfect conductors is described. The method is applied to the special case of magnetostatic surface-wave (MSSW) modes propagating in a ferrite thin film with arbitrary variations of the saturation magnetization through the film thickness. Methods for calculating dispersion relations, delay characteristics, and magnetostatic potential functions are discussed. The functional that is minimized is interpreted in terms of contributions to the mode energy. Also, concepts pertaining to homogeneous films such as mode bandwidth and dimensional scaling effects are extended to the general inhomogeneous case. Calculations for a two-layer film with a gradual transition region and an ion-implanted film are presented as numerical examples.}, number={3}, journal={IEEE Transactions on Microwave Theory and Techniques}, author={Buris, N.E. and Stancil, D.D.}, year={1986} }
 @article{buris_stancil_1986, title={MAGNETOSTATIC BACKWARD WAVES IN LOW DOSE ION IMPLANTED YIG FILMS.}, volume={MAG-22}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0022772145&partnerID=MN8TOARS}, number={5}, journal={IEEE Transactions on Magnetics}, author={Buris, Nikolaos E. and Stancil, Daniel D.}, year={1986} }
 @article{takahash_stancil_1986, title={Magnetostatic back ward waves in low dose ion implanted yio films}, volume={22}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84941502340&partnerID=MN8TOARS}, DOI={10.1109/TMAG.1986.1064571}, abstractNote={Magnetostatic backward volume wave (MSBVW) delay measurements are reported on a 4.8 µm thick YIG film ion implanted at a low dose (3× 1015ions/cm2) by a 320 keV beam of single ionized helium atoms ( He+). Nonuniform magnetization and uniaxial anisotropy profiles are used to model the ion implanted film. Calculated results fit the experimental data well. Expressions for the bias permeability tensor elements excluding crystalline (cubic) anisotropy are presented. A method is proposed to better characterize the magnetic properties of ferrimagnetic thin films. This method is applied to separate the uniaxial anisotropy field from the magnetization.}, number={5}, journal={IEEE Transactions on Magnetics}, author={Takahash, N.E. and Stancil, D.D.}, year={1986}, pages={859–861} }
 @article{stancil_1986, title={Phenomenological propagation loss theory for magnetostatic waves in thin ferrite films}, volume={59}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0000393852&partnerID=MN8TOARS}, DOI={10.1063/1.336867}, abstractNote={The phenomenological propagation loss theory based on the Gilbert form of the equation of motion for the magnetization is clarified for surface wave modes and extended to include volume wave modes. For small numbers, the expression 76.4ΔH (dB/μs) is found to accurately give forward volume wave losses, but to underestimate both surface and backward volume wave losses at low frequencies. Here ΔH is the full ferromagnetic resonance linewidth. As an example, the surface and backward volume wave losses at 3 GHz in yttrium iron garnet are more accurately given by 99.3ΔH (dB/μs) for small wave numbers. For a fixed bias field, surface wave losses per unit time are shown to be constant with frequency across the passband, whereas volume wave losses per unit time have a quadratic frequency dependence. After a review of existing experimental results, it is concluded that further data is necessary for a definitive test of the theory.}, number={1}, journal={Journal of Applied Physics}, author={Stancil, D.D.}, year={1986}, pages={218–224} }
 @article{halchin_stancil_1985, title={Comparison of magnetostatic surface wave propagation characteristics at 77 and 299 K}, volume={58}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33747432752&partnerID=MN8TOARS}, DOI={10.1063/1.336276}, abstractNote={The propagation of magnetostatic surface waves in yttrium iron garnet at 77 K is reported. The bandwidth was increased by about 60%, the dispersion was reduced, and the required bias field for a given frequency of operation was decreased by over 20% as compared to room-temperature results. These results can be explained by the increase in the magnetization of yttrium iron garnet at 77 K. In addition, the minimum delay line insertion loss was reduced by 1–2 dB at the lower temperature.}, number={11}, journal={Journal of Applied Physics}, author={Halchin, D.J. and Stancil, D.D.}, year={1985}, pages={4449–4451} }
 @article{buris_stancil_1985, title={Magneto Static Surface-Wave Propagation in Ferrite Thin Films with Arbitrary Variations of the Magnetization Through the Film Thickness}, volume={33}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0022083739&partnerID=MN8TOARS}, DOI={10.1109/TMTT.1985.1133103}, abstractNote={A variational formulation for the magnetostatic problem in an anisotropic and inhomogeneous region bounded by perfect conductors is described. The method is applied to the special case of magnetostatic surface-wave (MSSW) modes propagating in a ferrite thin film with arbitrary variations of the saturation magnetization through the film thickness. Methods for calculating dispersion relations, delay characteristics, and magnetostatic potential functions are discussed. The functional that is minimized is interpreted in terms of contributions to the mode energy. Also, concepts pertaining to homogeneous films such as mode bandwidth and dimensional scaling effects are extended to the general inhomogeneous case. Calculations for a two-layer film with a gradual transition region and an ion-implanted film are presented as numerical examples.}, number={6}, journal={IEEE Transactions on Microwave Theory and Techniques}, author={Buris, N.E. and Stancil, D.D.}, year={1985}, pages={484–491} }
 @article{buris_stancil_1985, title={Magnetostatic Volume Modes of Ferrite Thin Films with Magnetization Inhomogeneities Through the Film Thickness}, volume={MTT-33}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0022136518&partnerID=MN8TOARS}, DOI={10.1109/TMTT.1985.1133174}, abstractNote={A variational method recently used to analyze magnetostatic surface waves in films with arbitrary magnetization inhomogeneities through the film thickness is extended and applied to volume-wave modes in similar structures. Methods for calculating dispersion relations, delay characteristics, and magnetostatic potential functions for both forward and backward volume waves are discussed. Also, concepts pertaining to homogeneous films such as mode bandwidth and dimensional scaling effects are extended to the inhomogeneous case. Detailed consideration is given to a class of modes whose zero-wavenumber cutoff frequencies are associated with the minimum magnetization of the film. Calculations for Iinear and ion-implanted films are presented as numerical examples. Forward volume waves show greater sensitivity to the inhomogeneities than do backward volume waves for the cases considered.}, number={10}, journal={IEEE Transactions on Microwave Theory and Techniques}, author={Buris, N.E. and Stancil, D.D.}, year={1985}, pages={1089–1096} }
 @article{halchin_stancil_gualtieri_tumelty_1985, title={Magnetostatic wave propagation losses in thorium-substituted YIG}, volume={57}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0343241261&partnerID=MN8TOARS}, DOI={10.1063/1.334949}, abstractNote={YIG films were grown with thorium added to the melt in varying concentrations with a maximum Th/Y ratio of 0.487. The effect of the addition of thorium on the propagation of magnetostatic forward volume waves at X band was studied using a differential path delay line. It was found that the addition of thorium increased the propagation loss. For Th/Y ratios greater than 0.0428, magnetostatic forward volume waves could not be detected after propagation over a 1-cm path length. Although the variations in thorium content resulted in a range of lattice mismatches including both positive and negative values, there was no observable minimum in the loss corresponding to zero mismatch. It was also observed that the addition of thorium increased the dc conductivity, but calculations showed that the conductivity was not large enough to produce significant eddy current losses. We feel that the addition of thorium increased the amount of Fe2+ present in the films, thus activating the valence-exchange loss mechanism.}, number={8}, journal={Journal of Applied Physics}, author={Halchin, D.J. and Stancil, D.D. and Gualtieri, D.M. and Tumelty, P.F.}, year={1985}, pages={3724–3726} }
 @article{wallin_stancil_1985, title={Suppression of magnetostatic backward volume wave end reflections via field gradients}, volume={57}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-36549095359&partnerID=MN8TOARS}, DOI={10.1063/1.335001}, abstractNote={This paper reports the use of longitudinal magnetic field variations to suppress magnetostatic backward volume wave end reflections in an yttrium-iron-garnet (YIG) thin film. The variations were achieved by mounting the YIG film between two mumetal strips. The passband ripple in the insertion loss due to reflections was reduced from an average of about 12 dB peak to peak to 1/2 dB peak to peak with this technique.}, number={8}, journal={Journal of Applied Physics}, author={Wallin, S.J. and Stancil, D.D.}, year={1985}, pages={3718–3720} }
 @article{stancil_1984, title={A magnetostatic wave model for domain-wall collective excitations}, volume={56}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0021497160&partnerID=MN8TOARS}, DOI={10.1063/1.334184}, abstractNote={An analysis of collective excitations of stripe domains is presented which is similar to that used with magnetostatic waves in single-domain films. The analysis is valid when both the wavelength and film thickness are large compared to the stripe width. It is shown that the backward wave character of the waves results from the anisotropic nature of the effective susceptibility of the film obtained by averaging over many domains. Specifically, the susceptibility components parallel to the wall motion are found to be positive and constant whereas the perpendicular component is frequency dependent and can be negative. Expressions are also given for the electromagnetic fields associated with the waves.}, number={6}, journal={Journal of Applied Physics}, author={Stancil, D.D.}, year={1984}, pages={1775–1779} }
 @article{poston_stancil_1984, title={A new microwave ring resonator using guided magnetostatic surface waves}, volume={55}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0020723644&partnerID=MN8TOARS}, DOI={10.1063/1.333715}, abstractNote={A new microwave resonator based on guided magnetostatic surface waves is described. The waves are guided around a closed circular path by nonuniform in-plane fields. The ring resonator exhibits multiple resonances separated by approximately 10 MHz. Loaded Q’s as high as 1100 with 12 dB insertion loss and 1900 with 26 dB insertion loss have been observed. This resonator eliminates the fabrication complexity and losses associated with array reflector-type resonators and is potentially more compact since uniform fields over large sample areas are not required.}, number={6}, journal={Journal of Applied Physics}, author={Poston, T.D. and Stancil, D.D.}, year={1984}, pages={2521–2523} }
 @article{stancil_morgenthaler_1983, title={Guiding magnetostatic surface waves with nonuniform in-plane fields}, volume={54}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0020719350&partnerID=MN8TOARS}, DOI={10.1063/1.332146}, abstractNote={We report the propagation characteristics of magnetostatic surface waves in a rectangular yttrium iron garnet film placed between strips of mumetal and in the plane of the strips. The microstrip excitation structure was designed so as to permit the strips to extend along the entire path of propagation, thereby minimizing field nonuniformities in the longitudinal direction. These experiments suggest that nonuniform in-plane fields can be used to alter the dispersion characteristics of the waves. A theoretical argument is also presented describing a possible energy localization mechanism in nonuniform in-plane fields. In addition, experiments are described in which nonuniform fields caused by a slot in a mumetal covering layer are used to guide magnetostatic surface waves through a turn of 160°.}, number={3}, journal={Journal of Applied Physics}, author={Stancil, D.D. and Morgenthaler, F.R.}, year={1983}, pages={1613–1618} }
 @article{stancil_1983, title={Variational formulation of magnetostatic wave dispersion relations}, volume={19}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0020814617&partnerID=MN8TOARS}, DOI={10.1109/TMAG.1983.1062760}, abstractNote={A new variational formulation is described for the calculation of magnetostatic wave dispersion relations. Formulas are presented which should enable estimates of the effects of various inhomogeneities to be readily obtained, given a reasonable estimate of the magnetostatic potential Ψ. The results of numerical calculations are presented which demonstrate the relative insensitivity of the formulas to small errors in the trial function Ψ when applied to the well-known magnetostatic modes of an isolated ferrite slab.}, number={5}, journal={IEEE Transactions on Magnetics}, author={Stancil, D.D.}, year={1983}, pages={1865–1867} }
 @article{stancil_1982, title={MICROWAVE DIPLEXER USING MAGNETOSTATIC SURFACE AND BACKWARD VOLUME WAVES.}, volume={18}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0020099330&partnerID=MN8TOARS}, number={6}, journal={Electronics Letters}, author={Stancil, D.D.}, year={1982}, pages={269–270} }
 @article{stancil_1982, title={Magnetostatic wave precursors in thin ferrite films}, volume={53}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0019534781&partnerID=MN8TOARS}, DOI={10.1063/1.330929}, abstractNote={Precursors, or forerunners, are characteristic features of wave propagation in dispersive media. Magnetostatic wave precursors have the feature that their time of arrival does not depend on the center frequency of a propagating microwave pulse but can depend on the dc bias field. In the case of forward volume waves in an infinite, isolated slab, the arrival time depends on neither the frequency nor the bias field. This fact may prove to be of use in the physical characterization of thin films. A phenomenological theory for these precursors based on the approach taken by Sommerfeld and Brillouin is briefly described. In addition, experimental precursors due to forward volume waves, backward volume waves, and surface waves are reported. The qualitative and semiquantitative agreement between theory and experiment is very good.}, number={3}, journal={Journal of Applied Physics}, author={Stancil, D.D.}, year={1982}, pages={2658–2660} }
 @article{stancil_morgenthaler_1980, title={EFFECTS OF NONUNIFORM IN-PLANE FIELDS ON THE PROPAGATION CHARACTERISTICS OF MAGNETOSTATIC SURFACE WAVES.}, volume={1}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0019283292&partnerID=MN8TOARS}, journal={Ultrasonics Symposium Proceedings}, author={Stancil, D.D. and Morgenthaler, F.R.}, year={1980}, pages={547–551} }
 @article{stancil_morgenthaler_1980, title={Magnetostatic surface modes in a thin film with nonuniform in-plane fields}, volume={16}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0019060570&partnerID=MN8TOARS}, DOI={10.1109/TMAG.1980.1060804}, abstractNote={The experimental observation of magnetostatic surface waves (MSSW's) in a rectangular YIG film placed between strips of permalloy and in the plane of the strips is reported. In such a configuration, the DC magnetic field between the permalloy strips is primarily in-plane with a minimum halfway between and increasing toward each strip. In the presence of such a gradient, a series of discrete modes appears near the low frequency end of the normally continuous MSSW band. The frequencies of these modes lie below the bottom of the conventional MSSW band as calculated from the field at the center of the sample where the field is minimum. However, reversing the bias field reduces the coupling to these modes indicating a nonreciprocal surface localization. Estimates of the group velocities of these modes based on the slope of phase vs. frequency data indicate that the discrete modes travel several times faster than conventional MSSW's.}, number={5}, journal={IEEE Transactions on Magnetics}, author={Stancil, D.D. and Morgenthaler, F.R.}, year={1980}, pages={1156–1158} }
 @article{stancil_1980, title={Magnetostatic waves in nonuniform bias fields including exchange effects}, volume={16}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0019060857&partnerID=MN8TOARS}, DOI={10.1109/TMAG.1980.1060748}, abstractNote={The method of expansion in normal spin wave modes has been extended to the case of a two-dimensional nonuniformly magnetized ferrite with the effects of exchange included. The direction of the nonuniform bias field is normal to the plane of the ferrite. Using this method, a number of solutions (both exact and approximate) to the linearized magnetostatic equations have been obtained. Correspondence is pointed out between the new solutions, the spin wave theory of Eshbach, and the magnetostatic theory of Morgenthaler. These solutions further elucidate the role of exchange in magnetostatic wave propagation in nonuniform fields.}, number={5}, journal={IEEE Transactions on Magnetics}, author={Stancil, D.D.}, year={1980}, pages={1153–1155} }