@article{bharathan_narayan_rozgonyi_bulman_2013, title={Poisson Ratio of Epitaxial Germanium Films Grown on Silicon}, volume={42}, ISSN={["0361-5235"]}, DOI={10.1007/s11664-012-2337-6}, abstractNote={An accurate knowledge of elastic constants of thin films is important in understanding the effect of strain on material properties. We have used residual thermal strain to measure the Poisson ratio of Ge films grown on Si ⟨001⟩ substrates, using the sin2 ψ method and high-resolution x-ray diffraction. The Poisson ratio of the Ge films was measured to be 0.25, compared with the bulk value of 0.27. Our study indicates that use of Poisson ratio instead of bulk compliance values yields a more accurate description of the state of in-plane strain present in the film.}, number={1}, journal={JOURNAL OF ELECTRONIC MATERIALS}, author={Bharathan, Jayesh and Narayan, Jagdish and Rozgonyi, George and Bulman, Gary E.}, year={2013}, month={Jan}, pages={40–46} }
 @article{bulman_doverspike_sheppard_weeks_kong_dieringer_edmond_brown_swindell_schetzina_1997, title={Pulsed operation lasing in a cleaved-facet InGaN/GaN MQW SCH laser grown on 6H-SiC}, volume={33}, ISSN={["0013-5194"]}, DOI={10.1049/el:19971025}, abstractNote={Room temperature pulsed-operation lasing has been achieved for the first time in an InGaN laser grown on a 6H-SiC substrate. The laser structure is an 8-well InGaN/GaN MQW having Al0.06Ga0.94N waveguide and Al0.13Ga0.87N cladding layers. The index-guided laser having uncoated cleaved facets emits at 402 nm with a threshold current Ith of 1.2 A (42V), corresponding to a current density of 48 kA/cm2. A narrow line width of 0.8 A is observed at 1.09 Ith. Far field measurements indicate that the devices operate in the TEM01 mode with FWHP of 5.7 and 19° for the in-plane and perpendicular directions, respectively.}, number={18}, journal={ELECTRONICS LETTERS}, author={Bulman, GE and Doverspike, K and Sheppard, ST and Weeks, TW and Kong, HS and Dieringer, HM and Edmond, JA and Brown, JD and Swindell, JT and Schetzina, JF}, year={1997}, month={Aug}, pages={1556–1557} }