Ultra-Broadband Subwavelength Grating Coupler for Bound State in Continuum

被引：1

作者：

Wang, Junjia ^{[1
]}

Fang, Chongbao ^{[1
]}

Dong, Na ^{[1
]}

Jiang, Weifeng ^{[2
]}

Chen, Zhaofu ^{[1
]}

Chen, Lawrence R. ^{[3
]}

Sun, Xiaohan ^{[1
]}

机构：

[1] Southeast Univ, Sch Elect Sci & Engn, Natl Res Ctr Opt Sensors Commun Integrated Networ, Nanjing 210096, Jiangsu, Peoples R China

[2] Nanjing Univ Posts & Telecommun, Coll Elect & Opt Engn, Nanjing 210023, Peoples R China

[3] McGill Univ, Dept Elect & Comp Engn, Montreal, PQ H3A 0E9, Canada

来源：

IEEE PHOTONICS JOURNAL | 2022年 / 14卷 / 04期

基金：

加拿大自然科学与工程研究理事会; 中国国家自然科学基金;

关键词：

Optical waveguides; Couplings; Slabs; Refractive index; Bandwidth; Silicon; Propagation losses; Subwavelength structures; gratings; bound state in continuum; waveguide devices; EFFICIENT; LIGHT;

D O I：

10.1109/JPHOT.2022.3178882

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Grating couplers (GCs) are important for light to couple between optical fibers and photonic integrated circuits (PICs). The Bound State in Continuum (BIC) waveguides offer new functionalities for PIC. High-Q resonators, electro-optical modulator, and photodetectors can be built on it without etching steps. Due to the special waveguide geometry of BIC waveguides, a high efficiency GC is still missing. In this work, we demonstrated a subwavelength grating (SWG) GC for BIC waveguide with a coupling efficiency of 8 dB and a 1 dB bandwidth >70 nm. The device shows ultra-broadband behavior which is extremely useful for BIC-based PICs.

引用

页数：4

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