Chiral Light-Matter Interactions with Thermal Magnetoplasmons in Graphene Nanodisks

TL;DR

This paper explores thermal magnetoplasmons in doped graphene nanodisks, revealing their potential for strong, tunable chiral light-matter interactions and applications in perfect absorption and thermal emission.

Contribution

It introduces a semianalytical model for self-hybridized thermal magnetoplasmons in graphene nanodisks, highlighting their unique magneto-optical properties and tunability.

Findings

Thermal magnetoplasmons enable chiral perfect absorption.

Modes are tunable via carrier concentration, magnetic field, and temperature.

Array of nanodisks supports chiral thermal emission.

Abstract

We investigate the emergence of self-hybridized thermal magnetoplasmons in doped graphene nanodisks at finite temperatures when subjected to an external magnetic field. Using a semianalytical approach, which fully describes the eigenmodes and polarizability of the graphene nanodisks, we show that the hybridization originates from the coupling of transitions between thermally populated Landau levels and localized magnetoplasmon resonances of the nanodisks. Owing to their origin, these modes combine the extraordinary magneto-optical response of graphene with the strong field enhancement of plasmons, making them an ideal tool for achieving strong chiral light-matter interactions, with the additional advantage of being tunable through carrier concentration, magnetic field, and temperature. As a demonstration of their capabilities, we show that the thermal magnetoplasmons supported by an array of graphene nanodisks enable chiral perfect absorption and chiral thermal emission.