Abstract
A narrowband retroreflector consisting of a grating coupler and a waveguide cavity integrated on a highly reflective substrate is proposed. A theoretical model based on coupled-mode theories is discussed to provide analytical expression of the reflection and transmission coefficients under oblique incidence. The retroreflector was designed with a 20-µm aperture for 1540-nm-wavelength operation and 8-deg-angle incidence. Finite-difference time-domain simulation showed a retroreflection spectrum with a bandwidth of 2 nm and a maximum retroreflectance of 85% and a minimum specular reflectance of 5%.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Shogo Ura, Masahiro Nakata, Kenichi Yanagida, Junichi Inoue, and Kenji Kintaka
Opt. Express 24(13) 15120-15127 (2016)
Tomohiro Kondo, Shogo Ura, and Robert Magnusson
J. Opt. Soc. Am. A 32(8) 1454-1458 (2015)
Junichi Inoue, Atsushi Tsuji, Kenji Kintaka, Kenzo Nishio, and Shogo Ura
Opt. Express 26(3) 2212-2219 (2018)