Abstract
We present perfectly vertical grating couplers for the 220 nm silicon-on-insulator platform incorporating subwavelength metamaterials to increase the minimum feature sizes and achieve broadband low back-reflection. Our study reveals that devices with high coupling efficiencies are distributed over a wide region of the design space with varied back-reflections, while still maintaining minimum feature sizes larger than 100 nm and even 130 nm. Using 3D-finite-difference time-domain simulations, we demonstrate devices with broadband low back-reflection of less than ${-}{20}\;{\rm dB}$ over more than 100 nm bandwidth centered around the C-band. Coupling efficiencies of 72% and 67% are achieved for minimum feature sizes of 106 nm and 130 nm, respectively. These gratings are also more fabrication tolerant compared to similar designs not using metamaterials.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Yeyu Tong, Wen Zhou, and Hon Ki Tsang
Opt. Lett. 43(23) 5709-5712 (2018)
Xin Jin, Jinbin Xu, Cuiwei Xue, Chenxing Guo, Liucheng Fu, Min Liu, Yunliang Shen, Xueling Quan, and Xiulan Cheng
Opt. Lett. 49(7) 1856-1859 (2024)
Zanyun Zhang, Xia Chen, Qian Cheng, Ali Z. Khokhar, Xingzhao Yan, Beiju Huang, Hongda Chen, Hongwei Liu, Hongqiang Li, David J. Thomson, and Graham T. Reed
Opt. Lett. 44(20) 5081-5084 (2019)