Plasmonics of magnetic and topological graphene-based nanostructures

TL;DR

This paper reviews the plasmonic and magneto-optical properties of graphene-based nanostructures, emphasizing topological effects, chiral structures, and potential for enhanced plasmonic applications across a broad spectral range.

Contribution

It provides a comprehensive overview of magneto-plasmonics and topological phenomena in graphene nanostructures, highlighting new strategies for plasmonic enhancement and asymmetric SPP propagation.

Findings

Enhanced plasmonic effects in topologically distinct graphene structures

Observation of asymmetric SPP propagation on chiral meta-structures

Relations between structural and topological indices in graphene plasmonics

Abstract

Graphene is a unique material to study fundamental limits of plasmonics. Apart from the ultimate single-layer thickness, its carrier concentration can be tuned by chemical doping or applying an electric field. In this manner the electrodynamic properties of graphene can be varied from highly conductive to dielectric. Graphene supports strongly confined, propagating surface plasmon-polaritons (SPPs) in a broad spectral range from terahertz to mid-infrared frequencies. It also possesses a strong magneto-optical response and thus provides complimentary architectures to conventional magneto-plasmonics based on magneto-optically active metals or dielectrics. Despite of a large number of review articles devoted to plasmonic properties and applications of graphene, little is known about graphene magneto-plasmonics and topological effects in graphene-based nanostructures, which represent the main subject of this review. We discuss several strategies to enhance plasmonic effects in topologically distinct closed surface landscapes, i.e. graphene nanotubes, cylindric nanocavities and toroidal nanostructures. A novel phenomenon of the strongly asymmetric SPP propagation on chiral meta-structures and fundamental relations between structural and plasmonic topological indices are reviewed.