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50 nm-height SiO2 nanopillars enabled improved absorption in a few layers of MoS2 over the whole visible wavelength range.

We fabricated plasmonic hybrid nanostructures consisting of MoS 2 monolayer flakes and Au nanogratings with a period of 500 nm. The angle-resolved reflectance and photoluminescence spectra of the hybrid nanostructures clearly indicated a coupling between surface plasmon polaritons (SPPs) and incoming photons. The surface photovoltage (SPV) maps could visualize the spatial distribution of net charges while shining light on the sample. Considerable polarization and wavelength dependence of the SPV signals suggested that the SPP mode enhanced the light−matter interaction and resulting exciton generation in the MoS 2 monolayer. From the photoluminescence spectra and the morphology of the suspended MoS 2 region, it could be noted that light irradiation did not much raise the temperature of the MoS 2 monolayers on the nanogratings. Nanoscopic SPV and surface topography measurements could reveal the local optoelectronic and mechanical properties of MoS 2 monolayers. This work provided us insights into the proposal of a high-performance MoS 2 /metal optoelectronic devices, based on the understanding of the SPP−photon and SPP−exciton coupling.