Polarized exciton emission enhancement of monolayer MoS2 coupled with plasmonic Salisbury-type absorber

TL;DR

This study demonstrates a Salisbury-type plasmonic structure that significantly enhances and polarizes exciton emission in monolayer MoS2, offering new avenues for optoelectronic device development.

Contribution

It introduces a novel Salisbury-type plasmonic absorber that boosts photoluminescence and polarization in monolayer MoS2, advancing plasmon-exciton interaction control.

Findings

Up to 60-fold PL enhancement in MoS2.

PL linear polarization approaches 60%.

Polarization is independent of excitation laser polarization.

Abstract

The plasmon-mediated manipulation of light-matter interaction in two-dimensional atomically transition-metal dichalcogenides (TMDs) critically depends on the design of plasmonic nanostructures to achieve the maximum optical field in TMDs. Here, a metal-isolator-metal Salisbury-type perfect absorber was fabricated to serve as a generator of the localized surface plasmons. The significant photoluminescence (PL) enhancement up to 60-fold was observed experimentally in the monolayer (ML) MoS2 on the top of this gold plasmonic hybrid nanostructures. Furthermore, the PL linear polarization can approach ~60 % around the peak of exciton emission and is independent on the polarization of the excitation laser. This Salisbury-type plasmon-exciton hybrid system paves a new way to develop optoelectronic devices based on TMDs.