Abstract
We have investigated one-way surface plasmon-polaritons (SPPs) at the interface of a continuum magnetoplasma material and metal, in the presence of three-dimensional surface defects. Bulk electromagnetic modes of continuum materials have Chern numbers, analogous to those of photonic crystals. This can lead to the appearance of topologically-protected surface modes at material interfaces, propagating at frequencies inside the bandgap of the bulk materials. Previous studies considered two-dimensional structures; here we consider the effect of three-dimensional defects, and show that, although backward propagation/reflection cannot occur, side scattering does take place and has significant effect on the propagation of the surface mode. Several different waveguiding geometries are considered for reducing the effects of side-scattering, and we also consider the effects of metal loss.
Highlights
Both types of structures can be classified as being PTI, since in each of the cases the material itself is a bulk electromagnetic insulator supporting conducting surface states
In this paper we focus on the material that belongs to the PQHE type
The formalism that allows for the formal extension of the concept of PTI to the case of continuous media based on global features of the eigenmodes has been developed in ref
Summary
Both types of structures can be classified as being PTI, since in each of the cases the material itself is a bulk electromagnetic insulator supporting conducting surface states. We demonstrate that eigenmodes of bulk magnetoplasma possess non-trivial Chern numbers, which leads to propagation of the topologically non-trivial surface modes at the interface between the magnetoplasma and metal that are immune to backscattering.
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