Open AccessCompact and highly-efficient broadband surface grating antenna on a silicon platform
Author(s) -
Shahrzad Khajavi,
Daniele Melati,
Pavel Cheben,
Jens H. Schmid,
Qiankun Liu,
Dan Xu,
Winnie N. Ye
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.416986
Subject(s) - optics , diffraction efficiency , materials science , grating , broadband , silicon , diffraction , diffraction grating , optoelectronics , wavelength , bandwidth (computing) , antenna (radio) , blazed grating , telecommunications , physics , computer science
We present a compact silicon-based surface grating antenna design with a high diffraction efficiency of 89% (-0.5 dB) and directionality of 0.94. The antenna is designed with subwavelength-based L-shaped radiating elements in a 300-nm silicon core, maintaining high efficiency with a compact footprint of 7.6 µm × 4.5 µm. The reflectivity remains below -10 dB over the S, C and L optical communication bands. A broad 1-dB bandwidth of 230 nm in diffraction efficiency is achieved with a central wavelength of 1550 nm.