Abstract

An efficient vertical grating coupler design for arsenic trisulfide (${\mathrm{As}}_2{\mathrm{S}}_3$) on silicon dioxide (${\mathrm{SiO}}_2$) on lithium niobate (LN) is proposed, fabricated, and experimentally verified. We report 4 dB coupling efficiency per grating for vertical fiber coupling at a wavelength of 1550 nm with a 3 dB bandwidth of 40 nm using an aluminum reflector mirror between the LN and ${\mathrm{SiO}}_2$ interface. This coupler is the first step towards the demonstration of high-performance integrated photonic devices, which would simultaneously benefit from the acousto-optic properties of ${\mathrm{As}}_2{\mathrm{S}}_3$ and electro-optic and acoustic properties of LN. This hybrid platform is deemed to impact a broad range of applications such as imaging, ranging, and inertial sensing.

© 2019 Optical Society of America

High coupling efficiency waveguide grating couplers on lithium niobate

Xuetong Zhou, Ying Xue, Fan Ye, Ziyao Feng, Yuan Li, Xiankai Sun, Kei May Lau, and Hon Ki Tsang
Opt. Lett. 48(12) 3267-3270 (2023)

High-efficiency apodized bidirectional grating coupler for perfectly vertical coupling

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)

Efficient grating couplers on a thin film lithium niobate–silicon rich nitride hybrid platform

Yang Liu, Xingrui Huang, Zezheng Li, Huan Guan, Qingquan Wei, Zhongchao Fan, Weihua Han, and Zhiyong Li
Opt. Lett. 45(24) 6847-6850 (2020)

Low-loss grating coupler with a subwavelength structure on a thin-film lithium niobate substrate

Jing Huang, Nuo Chen, Kaizhong Chen, and Tao Chu
Opt. Lett. 49(2) 222-225 (2024)

High-efficiency chirped grating couplers on lithium niobate on insulator

Shuting Kang, Ru Zhang, Zhenzhong Hao, Di Jia, Feng Gao, Fang Bo, Guoquan Zhang, and Jingjun Xu
Opt. Lett. 45(24) 6651-6654 (2020)