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Active Light Control of the MoS2 Monolayer Exciton Binding Energy.
- Source :
-
ACS nano [ACS Nano] 2015 Oct 27; Vol. 9 (10), pp. 10158-64. Date of Electronic Publication: 2015 Sep 14. - Publication Year :
- 2015
-
Abstract
- Plasmonic excitation of Au nanoparticles deposited on a MoS2 monolayer 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.
Details
- Language :
- English
- ISSN :
- 1936-086X
- Volume :
- 9
- Issue :
- 10
- Database :
- MEDLINE
- Journal :
- ACS nano
- Publication Type :
- Academic Journal
- Accession number :
- 26348916
- Full Text :
- https://doi.org/10.1021/acsnano.5b03764