Real-time Exciton-Manipulation of Plexcitonic Coupling in a WS2-Ag nanocavity

TL;DR

This study demonstrates real-time control of plexcitonic coupling in monolayer WS2 coupled with a plasmonic nanocavity by adjusting solvent mixture ratios, enabling tunable Rabi splitting energies for advanced quantum and optical applications.

Contribution

It introduces a method for continuously tuning plexcitonic coupling in WS2 nanocavities through solvent composition adjustments, revealing the role of exciton population changes.

Findings

Rabi splitting energy tuned from 178 meV to 266 meV

Neutral exciton proportion increased from 59% to 100%

Potential for applications in quantum information and nonlinear optics

Abstract

We demonstrate the real-time exciton-manipulation of plexcitonic coupling in monolayer WS2 coupled to a plasmonic nanocavity by immersing into a mixed solution of dichloromethane (DCM) and ethanol. By adjusting the mixture ratio, a continuous tuning of the Rabi splitting energy ranged from 178 meV (in ethanol) to 266 meV (in DCM) is achieved. The results are mainly attributed to the remarkable increase of the proportion of neutral exciton in the monolayer WS2 (from 59% to 100%) as the concentration of DCM is increased. It offers an important stepping stone towards a further study of plexcitonic coupling in layered materials, along with potential applications in quantum information processing and nonlinear optical materials.