Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Akhil Raj Kumar Kalapala"'
Autor:
Ming Zhou, Akhil Raj Kumar Kalapala, Mingsen Pan, Ricky Gibson, Kevin James Reilly, Thomas Rotter, Garnesh Balakrishnan, Robert Bedford, Weidong Zhou, Shanhui Fan
Publikováno v:
ACS Photonics. 10:1519-1528
Autor:
Dong Liu, Weidong Zhou, Zhenqiang Ma, Baxter Moody, John D. Albrecht, Deyin Zhao, Akhil Raj Kumar Kalapala, Sang June Cho, Jeongpil Park
Publikováno v:
Opto-Electronic Advances, Vol 3, Iss 4, Pp 190025-1-190025-6 (2020)
We report here an optically pumped deep UV edge emitting laser with AlGaN multiple quantum wells (MQWs) active region grown on AlN substrate by low pressure organometallic vapor phase epitaxy (LP-OMVPE) in a high-temperature reactor. The 21 period Al
Autor:
Luke Overman, Cheng Guo, Akhil Raj Kumar Kalapala, Michael Vasilyev, James J. Coleman, Weidong Zhou
Publikováno v:
2021 IEEE Photonics Conference (IPC).
We report the intrinsic linewidth in a photonic crystal surface-emitting laser diode. An intrinsic linewidth of 330 kHz was obtained without any optical feedback, one order smaller than the value of DFB lasers. The impact of cavity feedback on linewi
Photonic crystal slabs are the state of the art in studies for the light confinement, optical wave modulating and guiding, as well as nonlinear optical response. Previous studies have shown abundant real-world implementations of photonic crystals in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0ea7454e7780634ea3299cf90949a836
http://arxiv.org/abs/2108.01160
http://arxiv.org/abs/2108.01160
Autor:
Sadhvikas Addamane, Robert Bedford, Haiwen Wang, Thomas J. Rotter, Alex Y. Song, Akhil Raj Kumar Kalapala, Shanhui Fan, Kevin James Reilly, Weidong Zhou, Ricky Gibson, Cheng Guo, Ganesh Balakrishnan
We show that by using a perturbed photonic Dirac-cone, one can realize ultra-narrow and finite Q-factor peak in the wavevector space, with both the peak value and the width separately tunable. We also discuss a lower bound in the minimal viable width
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::472bd2274212f05a5e22397bac1a83ab
Autor:
Emma J. Renteria, Thomas J. Rotter, Zhonghe Liu, Akhil Raj Kumar Kalapala, Kevin James Reilly, Shanhui Fan, Alex Y. Song, Ganesh Balakrishnan, Weidong Zhou
Publikováno v:
Conference on Lasers and Electro-Optics.
Epitaxial regrowth is investigated as a method of PCSEL fabrication and is compared to non-regrowth methods. The influence of regrowth to photonic crystal morphology is explored and optically pumped and electrically injected devices are demonstrated.
Optically Pumped 1 μm Low Threshold Photonic Crystal Surface Emitting Lasers Grown on GaAs Substrate
Autor:
Sadhvikas Addamane, Kevin James Reilly, Akhil Raj Kumar Kalapala, Shanhui Fan, Robert Bedford, Ricky Gibson, Alex Y. Song, Ganesh Balakrishnan, Weidong Zhou, Seungwon Yeom
Publikováno v:
2019 IEEE Photonics Conference (IPC).
We report optically pumped 1 μm low threshold GaAs photonic crystal surface emitting lasers. The GaAs photonic crystal is etched on 3-period InGaAs/AlGaAs MQW heterostructure. A laser peak is achieved at 1,006 nm with a linewidth of 0.6 nm at 5 kW/c
Publikováno v:
Novel In-Plane Semiconductor Lasers XVIII.
Photonic-crystal surface emitting lasers (PCSELs) exhibit several unique features compared to conventional vertical cavity surface-emitting lasers (VCSEL) including scalability, high power, and high beam quality. They are promising candidates in powe
Autor:
Weidong Zhou, Rafael Dalmau, Deyin Zhao, Sang June Cho, Dong Liu, Zhenqiang Ma, Akhil Raj Kumar Kalapala, John D. Albrecht, Jeongpil Park, Baxter Moody
Publikováno v:
Gallium Nitride Materials and Devices XIV.
Autor:
Joao M. Pina, Weidong Zhou, Mattias Hammar, Zhonghe Liu, Akhil Raj Kumar Kalapala, Carl Reuterskiöld Hedlund
Publikováno v:
physica status solidi (a). 218:2000416