Room temperature Tamm-Plasmon Exciton-Polaritons with a WSe2 monolayer

TL;DR

This paper demonstrates the formation of room temperature Tamm-plasmon exciton-polaritons using a WSe2 monolayer in a plasmonic cavity, advancing the development of ultra-compact, non-linear photonic circuits.

Contribution

It introduces a novel Tamm-plasmon-polariton structure with a WSe2 monolayer, achieving strong light-matter coupling at room temperature for the first time.

Findings

Observed exciton-polariton formation with 23.5 meV Rabi splitting.

Demonstrated anti-crossing in energy-momentum dispersion at room temperature.

Enabled potential for compact, non-linear photonic devices.

Abstract

Solid state cavity quantum electrodynamics is a rapidly advancing field which explores the frontiers of light-matter coupling. Plasmonic approaches are of particular interest in this field, since they carry the potential to squeeze optical modes to spaces significantly below the diffraction limit1,2, enhancing light-matter coupling. They further serve as an architecture to design ultra-fast, non-linear integrated circuits with smallest footprints3. Transition metal dichalcogenides are ideally suited as the active material in such circuits as they interact strongly with light at the ultimate monolayer limit4. Here, we implement a Tamm-plasmon-polariton structure, and study the coupling to a monolayer of WSe2, hosting highly stable excitons5. Exciton-Polariton formation at room temperature is manifested in the characteristic energy-momentum dispersion relation studied in photoluminescence, featuring an anti-crossing between the exciton and photon modes with a Rabi-splitting of 23.5 meV. Creating polaritonic quasi-particles in plasmonic architectures with atomic monolayers under ambient conditions is a crucial step towards compact, highly non-linear integrated photonic and polaritonic circuits6,7.