Back to Search Start Over

Metasurface Deflector Enhanced Grating Coupler for Perfectly Vertical Coupling.

Authors :
Wu, Xingyu
Qiu, Yang
Zheng, Shaonan
Zhao, Xingyan
Dong, Yuan
Zhong, Qize
Jia, Lianxi
Hu, Ting
Source :
Photonics; Apr2023, Vol. 10 Issue 4, p436, 11p
Publication Year :
2023

Abstract

We propose a perfectly vertical coupling scheme based on metasurface deflectors (meta-deflectors) and grating couplers (GCs). An approach for optimizing the GCs based on the Gaussian-fitting using the genetic algorithm is proposed. An meta-deflector based on amorphous silicon (a-Si) pillars is designed to the optimal coupling angle of the GC to ensure good coupling efficiency (CE). Simulations predict peak vertical CE to be 78% at the wavelength of 2 μm, with 1 dB bandwidth ≥35 nm. The design process of GC and meta-deflector is provided in detail, and the influence of fabrication error on the CE is analyzed. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
23046732
Volume :
10
Issue :
4
Database :
Complementary Index
Journal :
Photonics
Publication Type :
Academic Journal
Accession number :
163454782
Full Text :
https://doi.org/10.3390/photonics10040436