Robust surface plasmon polaritons on gyrotropic interfaces
Abstract
Unidirectional surface plasmon polaritons (SPPs) at the interface between a gyrotropic medium and a simple medium are studied in a newly-recognized frequency regime wherein the SPPs form narrow, beam-like patterns due to hyperbolic dispersion. The SPP beams are steerable by controlling parameters such as the cyclotron frequency (external bias) or the frequency of operation. The bulk band structure along different propagation directions is examined to ascertain a common bandgap, valid for all propagation directions, which the SPPs cross. The case of a finite-thickness gyrotropic slab is also considered, for which we present the Green function and examine the thickness and loss level required to maintain a unidirectional SPP.
Cite
@article{arxiv.1902.09002,
title = {Robust surface plasmon polaritons on gyrotropic interfaces},
author = {Samaneh Pakniyat and Alexander M. Holmes and George W. Hanson and S. Ali Hassani Gangaraj and Mauro Antezza and Mario G. Silveirinha and Shahrokh Jam and Francesco Monticone},
journal= {arXiv preprint arXiv:1902.09002},
year = {2025}
}
Comments
11 pages, 10 figures