Ultrathin gold film modified optical properties of excitons in monolayer MoS2.

摘要: Metal nanostructure plays an important role in tailoring the performance of various two-dimensional semiconductors. Herein, we theoretically study optical properties A, B and C excitons monolayer MoS2 coated on ultrathin gold films less than 20 nm thickness. We show that resonances these three occur at ∼660, ∼613 ∼426 nm, respectively each exciton maximizes absorption intensity total reflection. However, because scattering effect induced by film, maximum appears incident angle θm is larger its corresponding surface plasmon resonance θSPR. It possible due to gradual approach between θSPR, gradually increases with thickening film. For external reflection, around quasi-Brewster's angle, whereas which A or gives absorption, deviates from as film thickness decreases. This discrepancy explained dependencies extinction coefficients hybrid excitonic wavelength