@article{harris_ricketts_2023, title={Maximum gain enhancement in wireless power transfer using anisotropic metamaterials}, volume={13}, ISSN={["2045-2322"]}, DOI={10.1038/s41598-023-32415-9}, abstractNote={Abstract}, number={1}, journal={SCIENTIFIC REPORTS}, author={Harris, William Carter and Ricketts, David S.}, year={2023}, month={May} }
 @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} }
 @inproceedings{harris_nicholst_abbasi_ricketts_2016, title={A Versatile mm-wave micromachined anti-reflective layer}, DOI={10.1109/apmc.2016.7931298}, abstractNote={Micromachined millimeter-wave anti-reflective layers (mm-AR) offer a highly customizable and effective method to maximize power transmission through dielectric media. The power transmitted through an air-dielectric interface is maximized by adding an anti-reflective layer whose thickness is a quarter-wavelength and whose dielectric constant is the geometric mean of air and the dielectric, in analogous fashion to a quarter-wave transformer in transmission line theory. The mm-AR is an artificial dielectric material with controlled thickness and dielectric constant. A DRIE process forms a sub-wavelength lattice in a substrate that controls the material's effective dielectric response. The resulting anti-reflective layers were used to improve transmission through a silicon-air interface from an average of 40% across the W-band to 95%. While silicon was used in this work, the demonstrated impedance matching technique can be used for a wide variety of dielectric materials.}, booktitle={2016 asia-pacific microwave conference (apmc2016)}, author={Harris, W. and Nicholst, T. and Abbasi, M. and Ricketts, D.}, year={2016} }