Journal
ACS NANO
Volume 9, Issue 10, Pages 10158-10164Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b03764
Keywords
plasmonic hot electron; MoS2; absorption; exciton; active tuning
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Funding
- National Science Foundation of China [61422501, 11374023]
- National Basic Research Program of China (973 Program) [2015CB932403]
- Beijing Natural Science Foundation [L140007]
- Robert A. Welch Foundation [C-1222]
- U.S. Army Research Office MURI [W911NF-11-1-0362]
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Plasmonic excitation of Au nanoparticles deposited on a MoS2 inonolayer changes the absorption and photoluminescence characteristics of the material. Hot electrons generated from the Au nanoparticles are transferred into the MoS2 monolayers, resulting in n-doping. The doping effect of plasmonic hot electrons modulates the dielectric permittivity of materials, resulting in a red shift of both the absorption and the photoluminescence spectrum. This spectroscopic tuning was further investigated experimentally by using different Au nanoparticle concentrations, excitation laser wavelengths, and intensities. An analytical model for the photoinduced modulation of the MoS2 dielectric function and its exciton binding energy change is developed and used to estimate the doping density of plasmonic hot electrons. Our approach is important for the development of photonic devices for active control of light by light.
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