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：
中国国家自然科学基金; 加拿大自然科学与工程研究理事会;
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.
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页数：4
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