# Robust surface plasmon polaritons on gyrotropic interfaces

## TL;DR

This paper investigates unidirectional surface plasmon polaritons on gyrotropic interfaces, revealing their beam-like, steerable nature in a hyperbolic dispersion regime, with analysis of band structure and finite-thickness effects.

## Contribution

It introduces a new frequency regime for SPPs on gyrotropic interfaces, demonstrating their beam-like, steerable behavior and analyzing conditions for unidirectionality in finite slabs.

## Key findings

- SPPs form narrow, beam-like patterns due to hyperbolic dispersion.
- Steering of SPP beams is possible via external bias or frequency control.
- Finite-thickness gyrotropic slabs can support unidirectional SPPs under certain conditions.

## 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.