Absorbance Enhancement of Monolayer MoS2 in a Perfect Absorbing System
Abstract
We reveal numerically and experimentally that dielectric resonance can enhance the absorbance and emission of monolayer MoS2. By quantifying the absorbance of the Si disk resonators and the monolayer MoS2 separately, a model taking into account of absorbance as well as quantum efficiency modifications by the dielectric disk resonators successfully explains the observed emission enhancement under the normal light incidence. It is demonstrated that the experimentally observed emission enhancement at different pump wavelength results from the absorbance enhancement, which compensates the emission quenching by the disk resonators. In order to further maximize the absorbance value of monolayer MoS2, a perfect absorbing structure is proposed. By placing a Au mirror beneath the Si nanodisks, the incident electromagnetic power is fully absorbed by the hybrid monolayer MoS2-disk system. It is demonstrated that the electromagnetic power is re-distributed within the hybrid structure and 53\% of the total power is absorbed by the monolayer MoS2 at the perfect absorbing wavelength.
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