Selective amplification of primary exciton in monolayer MoS2

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.

arXiv comment4 pages,4 figures

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Cited by in corpus (3)

• Controlled integration of MoS2 flakes on nanopores by means of electrophoretic deposition
• Directional emission from WS2 monolayer coupled to plasmonic Nanowire-on-Mirror Cavity
• Directing Monolayer Tungsten Disulfide Photoluminescence using a Bent Plasmonic Nanowire on a Mirror Cavity