Open AccessSubwavelength structure enabled ultra-long waveguide grating antenna
Author(s) -
Jiaxin Chen,
Jinzhao Wang,
Jiewen Li,
Yong Yao,
Yunxu Sun,
Jiajun Tian,
Yi Zou,
Xiangjie Zhao,
Xiaochuan Xu
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.421529
Subject(s) - grating , optics , waveguide , photonics , materials science , antenna (radio) , silicon photonics , beam steering , beam divergence , optoelectronics , beam (structure) , physics , beam diameter , laser , telecommunications , laser beams , computer science
Because of the high index contrast, current silicon photonics based optical phased arrays cannot achieve small beam divergence and large field-of-view simultaneously without increasing fabrication complexity. To resolve the dilemma, we propose an ultra-long waveguide grating antenna formed by placing subwavelength segments within the evanescent field of a conventional strip waveguide. Bound state in the continuum effect is leveraged to suppress the sidewall emission. As a proof of concept, we theoretically demonstrated a millimeter-long through-etched waveguide grating antenna with a divergence angle of 0.081° and a feature size compatible with current silicon photonics foundries.