Inverse-designed broadband low-loss grating coupler on thick lithium-niobate-on-insulator platform

2023/09/22 by Yijun Xie, Xie, Yijun, Mingming Nie +3
Engineering · Materials Science · Physics and Astronomy · #Applied Physics (physics.app-ph) #FOS: Physical sciences #Optical Coatings and Gratings #Optics (physics.optics) #Photonic and Optical Devices #Photorefractive and Nonlinear Optics

paper · pdf · doi:10.48550/arxiv.2309.12976

openalex publication_date 2023/09/22 · openalex created_date 2023/09/26 · openalex updated_date 2026/08/01

Abstract

A grating coupler on 700-nm-thick Z-cut lithium-niobate-on-insulator platform with high coupling efficiency, large bandwidth, and high fabrication tolerance is designed and optimized by inverse design method. The optimized grating coupler is fabricated with a single set of e-beam lithography and etching process, and it is experimentally characterized to possess peak coupling efficiency of -3.8 dB at 1574.93 nm, 1-dB bandwidth of 71.7 nm, and 3-dB bandwidth of over 120 nm.

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