Abstract
III-nitride nanorings fabricated from a combination of hybrid-nanosphere-lithography and laser lift-off processes is demonstrated. Being formed on an interfacial metallic layer optically coupling between the optical ring and its substrate is eliminated, maximizing optical confinement of whispering gallery resonant mode within the ring cavity. The tapered cross-sectional profile also promotes coupling of emitted light into resonant modes. Optically pumped lasing with a dominant peak at 421.5 nm is observed at room temperature, with threshold energy density of . Etch-induced sidewall roughness causes scattering of light at the interface to diminish confinement, and is also responsible for the mode-splitting effect according to finite-difference time-domain simulations.
© 2015 Optical Society of America
Full Article | PDF ArticleMore Like This
Xuhui Zhang, Yuk Fai Cheung, Yiyun Zhang, and H. W. Choi
Opt. Lett. 39(19) 5614-5617 (2014)
Gangyi Zhu, Jiaping Li, Jitao Li, Jiyuan Guo, Jun Dai, Chunxiang Xu, and Yongjin Wang
Opt. Lett. 43(4) 647-650 (2018)
Yen-Chih Lin, Ming-Hua Mao, Chen-Jun Wu, and Hao-Hsiung Lin
Opt. Lett. 40(9) 1904-1907 (2015)