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Physical mechanism on exciton-plasmon coupling revealed by femtosecond pump-probe transient absorption spectroscopy.

Lin, Weihua LU ; Shi, Y. ; Yang, X. ; Li, J. ; Cao, E. ; Xu, X. ; Pullerits, Tönu LU ; Liang, W and Sun, Mengtao LU (2017) In Materials Today Physics 3. p.33-40
Abstract
The unclear mechanism of exciton-plasmon coupling interaction in monolayer MoS2-Ag nanoparticles hybrid, as a longstanding target in molecular nanotechnology and catalysis, is systemically investigated with transmission spectra and femtosecond pump-probe transient absorption spectroscopy in this paper. The properties of exciton in monolayer MoS2 are strongly enhanced due to the local surface plasmon resonance (LSPR) induced by Ag nanoparticles, and manifested by obvious changes in transmission spectra. Furthermore, we discuss the dynamic processes of exciton-plasmon coupling interaction with the femtosecond transient absorption spectroscopy, which indicates that there are three lifetimes, Auger scattering, electron-electron interaction and... (More)
The unclear mechanism of exciton-plasmon coupling interaction in monolayer MoS2-Ag nanoparticles hybrid, as a longstanding target in molecular nanotechnology and catalysis, is systemically investigated with transmission spectra and femtosecond pump-probe transient absorption spectroscopy in this paper. The properties of exciton in monolayer MoS2 are strongly enhanced due to the local surface plasmon resonance (LSPR) induced by Ag nanoparticles, and manifested by obvious changes in transmission spectra. Furthermore, we discuss the dynamic processes of exciton-plasmon coupling interaction with the femtosecond transient absorption spectroscopy, which indicates that there are three lifetimes, Auger scattering, electron-electron interaction and electron-phonon interaction, and illustrate the reason of the enlarged lifetime in hybrid system. Meanwhile, the intensity of A excitonic state in femtosecond transient absorption spectroscopy is significantly enhanced by LSPR, instead of excitonic state B. In conclusion, our study can promote the deeper understanding and illustrate the unique merits of the exciton-plasmon coupling interaction in the monolayer MoS2-Ag nanoparticles hybrid system. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Materials Today Physics
volume
3
pages
33 - 40
publisher
Elsevier Ltd
external identifiers
  • scopus:85038838270
ISSN
2542-5293
DOI
10.1016/j.mtphys.2017.12.001
language
English
LU publication?
yes
id
dec43783-d2b8-4db0-9674-02dcde42d660
date added to LUP
2019-09-14 14:00:55
date last changed
2020-10-07 06:42:16
@article{dec43783-d2b8-4db0-9674-02dcde42d660,
  abstract     = {The unclear mechanism of exciton-plasmon coupling interaction in monolayer MoS2-Ag nanoparticles hybrid, as a longstanding target in molecular nanotechnology and catalysis, is systemically investigated with transmission spectra and femtosecond pump-probe transient absorption spectroscopy in this paper. The properties of exciton in monolayer MoS2 are strongly enhanced due to the local surface plasmon resonance (LSPR) induced by Ag nanoparticles, and manifested by obvious changes in transmission spectra. Furthermore, we discuss the dynamic processes of exciton-plasmon coupling interaction with the femtosecond transient absorption spectroscopy, which indicates that there are three lifetimes, Auger scattering, electron-electron interaction and electron-phonon interaction, and illustrate the reason of the enlarged lifetime in hybrid system. Meanwhile, the intensity of A excitonic state in femtosecond transient absorption spectroscopy is significantly enhanced by LSPR, instead of excitonic state B. In conclusion, our study can promote the deeper understanding and illustrate the unique merits of the exciton-plasmon coupling interaction in the monolayer MoS2-Ag nanoparticles hybrid system.},
  author       = {Lin, Weihua and Shi, Y. and Yang, X. and Li, J. and Cao, E. and Xu, X. and Pullerits, Tönu and Liang, W and Sun, Mengtao},
  issn         = {2542-5293},
  language     = {eng},
  pages        = {33--40},
  publisher    = {Elsevier Ltd},
  series       = {Materials Today Physics},
  title        = {Physical mechanism on exciton-plasmon coupling revealed by femtosecond pump-probe transient absorption spectroscopy.},
  url          = {http://dx.doi.org/10.1016/j.mtphys.2017.12.001},
  doi          = {10.1016/j.mtphys.2017.12.001},
  volume       = {3},
  year         = {2017},
}