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.
Highlights
Two-dimensional (2D) transition metal dichalcogenides (TMDCs) hold significant promise for future optoelectronic applications[1,2]
We show that PL intensity modulation is controlled via both optical field enhancement and spontaneous emission rate enhancement
Zoomed in scanning electron microscope (SEM) images of the two different fabricated Au NC arrays are shown in Fig. 2e and f, respectively
Summary
Two-dimensional (2D) transition metal dichalcogenides (TMDCs) hold significant promise for future optoelectronic applications[1,2]. This coupling can be modulated by engineering the arrangement of Au cone shaped nanopillars. We have experimentally and numerically studied the effect of gold (Au) plasmonic NC arrays arranged on top of an atomically thin MoS2 layer on a SiO2/Si substrate for two different array periodicities along x- and y- axes of the NC arrays We have demonstrated both enhancement and quenching of photoluminescence of monolayer MoS2 by exploiting the coupling with NC arrays. Enhancement and quenching of luminescence from plasmonic array on ML MoS2 structure and its far field radiation profile have been studied numerically
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