Grating coupler on single-crystal lithium niobate thin film

被引：32

作者：

Chen, Zhihua ^{[1
]}

Wang, Yiwen ^{[1
]}

Jiang, Yunpeng ^{[1
]}

Kong, Ruirui ^{[1
]}

Hu, Hui ^{[1
]}

机构：

[1] Shandong Univ, Sch Phys, Jinan 250100, Shandong, Peoples R China

来源：

OPTICAL MATERIALS | 2017年 / 72卷

基金：

中国国家自然科学基金;

关键词：

Lithium niobate; Thin film; LNOI; Grating coupler; Fiber; WAVE-GUIDES; FIBER; CHIP; RESONATORS; COMPACT;

D O I：

10.1016/j.optmat.2017.05.061

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The grating coupler on single-crystal lithium niobate thin film (lithium niobate on insulator, LNOI) was designed. A bottom reflector was added in the LNOI material to improve the coupling efficiency. The grating structure was optimized by FDTD method. The material parameters such as layer thickness of lithium niobate thin film, SiO2 thickness were discussed with respect to the coupling efficiency, and the tolerances of grating period, etch depth, groove width and fiber position were also studied systematically. The simulated maximum coupling efficiency from a grating coupler with (without) bottom reflector to a single-mode fiber is about 78% (40%) in z-cut LNOI for TE polarization. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：136 / 139

页数：4

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