Dynamic control of dipole decay rate via graphene plexcitons

TL;DR

This paper demonstrates a method to dynamically control the decay rate of quantum emitters by tuning plexcitonic modes in a graphene-based nanostructure, enabling reversible emission modulation in the infrared range.

Contribution

It introduces a novel approach to actively and reversibly control dipole decay rates using voltage-tunable graphene plexcitons in the strong coupling regime.

Findings

Achieved continuous and reversible decay rate control via voltage bias.

Observed sharper plexcitonic peaks indicating higher sensitivity.

Demonstrated potential for reconfigurable quantum photonic devices.

Abstract

Active control of the radiative properties of quantum emitters through engineered light-matter interactions is a key challenge in nanophotonics and quantum optics. In this work, we demonstrate dynamic modulation of dipole's decay rate by exploiting the tunable plexcitonic modes (graphene plasmons and QD-excitons) in the strong coupling regime. By integrating a quantum dot inside a graphene spherical shell and tuning the local optical response of hybrid modes via voltage-bias, we achieve continuous and reversible control over the decay rate, leading to significant enhancement or suppression of dipole emission from near- to far-infrared regime. Furthermore, the plexcitonic peaks shows much sharper linewidths in contrast to bare graphene plasmons even in the off-resonant coupling which indicates higher sensitivity of the systems at tuned wavelengths. We demonstrate the phenomenon with the numerical solution of 3D Maxwell's equations using MNPBEM tool. Our approach demonstrate a versatile platform for programmable emission control and offer a promising pathway for developing reconfigurable quantum photonic devices, such as tunable single-photon sources and ultrafast optical switches.