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Title: Ultrathin gold film modified optical properties of excitons in monolayer MoS2
Authors: Jia, GY 
Zhang, Q 
Huang, ZX
Bin Huang, S
Xu, J
Issue Date: 2017
Publisher: Royal Society of Chemistry
Source: Physical chemistry chemical physics, 2017, v. 19, no. 40, p. 27259-27265 How to cite?
Journal: Physical chemistry chemical physics 
Abstract: Metal nanostructure plays an important role in tailoring the performance of various two-dimensional semiconductors. Herein, we theoretically study the optical properties of A, B and C excitons in monolayer MoS2 coated on ultrathin gold films less than 20 nm in thickness. We show that resonances of these three excitons occur at similar to 660, similar to 613 and similar to 426 nm, respectively and each exclton maximizes absorption intensity at total reflection. However, because of the optical scattering effect induced by the ultrathin gold film, the maximum absorption of each exclton appears at the incident angle 0m that is larger than its corresponding surface plasmon resonance angle theta(SPR). It is possible that due to the gradual approach between theta(m) and theta(SPR), the maximum absorption intensity of the exclton gradually increases with thickening of the gold film. For external reflection, the C exclton maximizes absorption intensity around its corresponding quasi-Brewster's angle, whereas the incident angle, at which the A or B exclton gives the maximum absorption, gradually deviates from its corresponding quasi-Brewster's angle as the gold film thickness decreases. This discrepancy is explained by the dependencies of extinction coefficients of hybrid films on the excltonlc resonance wavelength and gold film thickness.
ISSN: 1463-9076
EISSN: 1463-9084
DOI: 10.1039/c7cp05260j
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