Abstract
Microring resonators with angular gratings distributed along the inner wall are proposed to achieve single-mode microlasers. Based on a numerical investigation using the finite element method, we find that the inner-wall gratings create a periodic perturbation and couple the whispering-gallery modes into low-angular-momentum components, resulting in an enhancement of radiation loss. By properly arranging the inner-wall grating protrusion number as a nontrivial divisor of , we can have the mode with azimuthal mode number as the only high mode for single-mode operation. The impacts of grating depth, microring width, and grating duty cycle are investigated by 2D simulation for the optimization of mode coupling and radiation loss. Finally, the mode selection mechanism is verified based on a 3D simulation.
© 2016 Optical Society of America
Full Article | PDF ArticleMore Like This
Xiu-Wen Ma, Xiao-Meng Lv, Yong-Zhen Huang, Yue-De Yang, Jin-Long Xiao, and Yun Du
J. Opt. Soc. Am. B 31(11) 2773-2778 (2014)
Amir Arbabi, Seyedeh Mahsa Kamali, Ehsan Arbabi, Benjamin G. Griffin, and Lynford L. Goddard
Opt. Express 23(4) 5335-5347 (2015)
Yong-Heng Zhang, Yong-Zhen Huang, Ya-Qian Ye, Yue-De Yang, and Jin-Long Xiao
J. Opt. Soc. Am. B 37(5) 1312-1319 (2020)