Size and host-medium effects on topologically protected surface states in bianisotropic three-dimensional optical waveguides
Journal
Physical Review B
Journal Volume
98
Journal Issue
7
Date Issued
2018
Author(s)
Abstract
We study the optical properties of bianisotropic optical waveguides with nontrivial topological structure in wave-vector space, placed in an ordinary dielectric matrix. We derive an exact analytical description of the eigenmodes of the systems with arbitrary parameters that allows us to investigate topologically protected surface states (TPSS) in details. In particular, we find that the TPSS in the waveguides would disappear (1) if their radius is smaller than a critical value due to the dimensional quantization of azimuthal wave number, and also (2) if the permittivity of the host medium exceeds a critical value. Interestingly, we discover that the TPSS in the waveguides have negative refraction for some structures. We construct a TPSS phase diagram that will guide the development of topological waveguides for optical interconnects and devices.
Publisher
American Physical Society
Type
journal article