Nanophotonics with 2D Transition Metal Dichalcogenides

TL;DR

This paper reviews recent advances in nanophotonics using 2D transition metal dichalcogenides, highlighting their optical properties, excitonic behavior, and hybrid exciton-polariton structures with nanocavities for quantum and nanophotonic applications.

Contribution

It provides a comprehensive overview of the state-of-the-art in hybrid exciton-polariton systems based on monolayer TMDCs and discusses future research directions.

Findings

Enhanced quantum yield of exciton emission in TMDC-coupled nanocavities

Detailed analysis of excitonic properties and valley dynamics in TMDCs

Exploration of weak and strong coupling regimes in TMDC-based systems

Abstract

Two-dimensional transition metal dichalcogenides (TMDCs) have recently become attractive semiconductor materials for several optoelectronic applications, such as photodetection, light harvesting, phototransistors, light-emitting diodes, and lasers. They are particularly appealing because their bandgap lies in the visible and near-IR range, and they possess strong excitonic resonances, high oscillator strengths, and valley-selective response. Coupling these materials to optical nanocavities enhances the quantum yield of exciton emission, enabling advanced quantum optics and nanophotonic devices. Here, we review state-of-the-art advances on hybrid exciton-polariton structures based on monolayer TMDCs coupled to plasmonic and dielectric nanocavities. We first generally discuss the optical properties of 2D WS2, WSe2, MoS2 and MoSe2 materials, paying special attention to their energy and photoluminescence/absorption spectra, excitonic fine structure, and to the dynamics of exciton formation and valley depolarization. We then discuss light-matter interactions in hybrid exciton-polariton structures. Finally, we focus on weak and strong coupling regimes in monolayer TMDCs-based exciton-polariton systems, envisioning research directions and future opportunities based on this novel material platform.