Broadband high reflectivity in subwavelength-grating slab waveguides
Optics
2015-09-17 v1
Abstract
We computationally study a subwavelength dielectric grating structure, show that slab waveguide modes can be used to obtain broadband high reflectivity, and analyze how slab waveguide modes influence reflection. A structure showing interference between Fabry-Perot modes, slab waveguide modes, and waveguide array modes is designed with ultra-broadband high reflectivity. Owing to the coupling of guided modes, the region with reflectivity R > 0.99 has an ultra-high bandwidth ( {\Delta}f/f > 30%). The incident-angle region with R > 0.99 extends over a range greater than 40{\deg}. Moreover, an asymmetric waveguide structure is studied using a semiconductor substrate.
Cite
@article{arxiv.1509.04815,
title = {Broadband high reflectivity in subwavelength-grating slab waveguides},
author = {Xuan Cui and Hao Tian and Zhongxiang Zhou},
journal= {arXiv preprint arXiv:1509.04815},
year = {2015}
}