Exciton Emission Intensity Modulation of Monolayer MoS2 via Au Plasmon Coupling.

Abstract:

:Modulation of photoluminescence of atomically thin transition metal dichalcogenide two-dimensional materials is critical for their integration in optoelectronic and photonic device applications. By coupling with different plasmonic array geometries, we have shown that the photoluminescence intensity can be enhanced and quenched in comparison with pristine monolayer MoS2. The enhanced exciton emission intensity can be further tuned by varying the angle of polarized incident excitation. Through controlled variation of the structural parameters of the plasmonic array in our experiment, we demonstrate modulation of the photoluminescence intensity from nearly fourfold quenching to approximately threefold enhancement. Our data indicates that the plasmonic resonance couples to optical fields at both, excitation and emission bands, and increases the spontaneous emission rate in a double spacing plasmonic array structure as compared with an equal spacing array structure. Furthermore our experimental results are supported by numerical as well as full electromagnetic wave simulations. This study can facilitate the incorporation of plasmon-enhanced transition metal dichalcogenide structures in photodetector, sensor and light emitter applications.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Mukherjee B,Kaushik N,Tripathi RP,Joseph AM,Mohapatra PK,Dhar S,Singh BP,Kumar GV,Simsek E,Lodha S

doi

10.1038/srep41175

subject

Has Abstract

pub_date

2017-01-30 00:00:00

pages

41175

issn

2045-2322

pii

srep41175

journal_volume

7

pub_type

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