Enhanced Excitation and Emission from 2D Transition Metal Dichalcogenides with All-Dielectric Nanoantennas

TL;DR

This paper demonstrates that all-dielectric silicon nanoantennas can significantly enhance the photoluminescence of 2D transition metal dichalcogenides, enabling improved nanophotonic and optoelectronic device performance.

Contribution

It provides a comprehensive analysis and numerical demonstration of maximizing PL enhancement in 2D TMDCs using optimized all-dielectric nanoantennas, a novel approach in nanophotonics.

Findings

PL enhancement factor of up to 100 times achieved

Optimal system parameters identified for maximal enhancement

Numerical models confirm significant light-matter interaction improvements

Abstract

The recently emerged concept of all-dielectric nanophotonics based on optical Mie resonances in high-index dielectric nanoparticles has proven a promising pathway to boost light-matter interactions at the nanoscale. In this work, we discuss the opportunities enabled by the interaction of dielectric nanoresonators with 2D transition metal dichalcogenides (2D TMDCs), leading to weak and strong coupling regimes. We perform a comprehensive analysis of bright exciton photoluminescence (PL) enhancement from various 2D TMDCs, including WS2, MoS2, WSe2, and MoSe2 via their coupling to Mie resonances of a silicon nanoparticle. For each case, we find the system parameters corresponding to maximal PL enhancement taking into account excitation rate, Purcell factor, and radiation efficiency. We demonstrate numerically that all-dielectric Si nanoantennas can significantly enhance the PL intensity from 2D TMDC by a factor of hundred through precise optimization of the geometrical and material parameters. Our results may be useful for high-efficiency 2D TMDC-based optoelectronic, nanophotonic, and quantum optical devices.