Photon Emission Rate Engineering using Graphene Nanodisc Cavities

TL;DR

This paper investigates how to engineer photon emission rates using graphene nanodisc cavities by tuning plasmon modes and emitter positioning, demonstrating enhanced radiative efficiency through mode coupling.

Contribution

It introduces a systematic approach to control quantum emitter decay rates via graphene nanodisc cavities using Fermi level tuning and spatial configuration.

Findings

Coupling to bright plasmon modes enhances radiative efficiency.

Dark plasmon modes suppress radiative efficiency.

Good agreement between semi-analytical and full-wave simulations.

Abstract

In this work, we present a systematic study of the plasmon modes in a system of vertically stacked pair of graphene discs. Quasistatic approximation is used to model the eigenmodes of the system. Eigen-response theory is employed to explain the spatial dependence of the coupling between the plasmon modes and a quantum emitter. These results show a good match between the semi-analytical calculation and full-wave simulations. Secondly, we have shown that it is possible to engineer the decay rates of a quantum emitter placed inside and near this cavity, using Fermi level tuning, via gate voltages and variation of emitter location and polarization. We highlighted that by coupling to the bright plasmon mode, the radiative efficiency of the emitter can be enhanced compared to the single graphene disc case, whereas the dark plasmon mode suppresses the radiative efficiency.