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.

11 pages, 10 figures

References in corpus (11)

• Topological Photonics
• Topological Photonics
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• Reflection-Free One-Way Edge Modes in a Gyromagnetic Photonic Crystal
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• Unidirectional and diffractionless surface plasmon-polaritons on three-dimensional nonreciprocal plasmonic platforms
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• Continuum damping of topologically-protected edge modes at the boundary of a magnetized plasma
• Unidirectional Curved Surface Plasmon Polariton in a Radially Magnetized System
• Current-induced nonreciprocity and refraction-free propagation in a one-dimensional graphene-based photonic crystal