Selective amplification of primary exciton in monolayer MoS2

TL;DR

This study demonstrates a method to selectively amplify the primary exciton in monolayer MoS2 using cyclic plasmon propagation with a silver nanowire, significantly enhancing A0 emission without cavity effects.

Contribution

It introduces a novel plasmonic re-excitation technique to selectively amplify the primary exciton in monolayer MoS2, overcoming limitations of weak light absorption.

Findings

Achieved ~20-fold selective amplification of A0 exciton

Enhanced primary exciton emission without cavity effects

Reduced multiexciton contributions

Abstract

Optoelectronics applications for transition-metal dichalcogenides are still limited by weak light absorption and their complex exciton modes are easily perturbed by varying excitation conditions, because they are inherent in atomically thin layers. Here, we propose a method of selectively amplifying the primary exciton (A0) among the exciton complexes in monolayer MoS2 via cyclic re-excitation of cavity-free exciton-coupled plasmon propagation. This was implemented by partially overlapping a Ag nanowire (NW) on a MoS2 monolayer separated by a thin SiO2 spacer. Exciton-coupled plasmons in the NW enhance the A0 radiation in MoS2. The cumulative amplification of emission enhancement by cyclic plasmon travelling reaches ~20-fold selectively for the A0, while excluding other B exciton and multiexciton by significantly reduced band-filling, without oscillatory spectra implying plasmonic cavity effects.