Surface-enhanced Raman scattering and fluorescence near metal nanoparticles
(2005) In Physical Review B (Condensed Matter and Materials Physics) 72(3).- Abstract
- We present a general model study of surface-enhanced resonant Raman scattering and fluorescence, focusing on the interplay between electromagnetic (EM) effects and the molecular dynamics as treated by a density matrix calculation. The model molecule has two electronic levels, is affected by radiative and nonradiative damping mechanisms, and a Franck-Condon mechanism yields electron-vibration coupling. The coupling between the molecule and the electromagnetic field is enhanced by placing it between two Ag nanoparticles. The results show that the Raman scattering cross section can, for realistic parameter values, increase by some 10 orders of magnitude (to similar to 10(-14) cm(2)) compared with the free-space case. Also the fluorescence... (More)
- We present a general model study of surface-enhanced resonant Raman scattering and fluorescence, focusing on the interplay between electromagnetic (EM) effects and the molecular dynamics as treated by a density matrix calculation. The model molecule has two electronic levels, is affected by radiative and nonradiative damping mechanisms, and a Franck-Condon mechanism yields electron-vibration coupling. The coupling between the molecule and the electromagnetic field is enhanced by placing it between two Ag nanoparticles. The results show that the Raman scattering cross section can, for realistic parameter values, increase by some 10 orders of magnitude (to similar to 10(-14) cm(2)) compared with the free-space case. Also the fluorescence cross section grows with increasing EM enhancement, however, at a slower rate, and this increase eventually stalls when nonradiative decay processes become important. Finally, we find that anti-Stokes Raman scattering is possible with strong incident laser intensities similar to 1 mW/mu m(2). (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/910616
- author
- Johansson, P ; Xu, Hongxing LU and Kall, M
- organization
- publishing date
- 2005
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B (Condensed Matter and Materials Physics)
- volume
- 72
- issue
- 3
- article number
- 035427
- publisher
- American Physical Society
- external identifiers
-
- wos:000230890200171
- scopus:33749158826
- ISSN
- 1098-0121
- DOI
- 10.1103/PhysRevB.72.035427
- language
- English
- LU publication?
- yes
- id
- 6f1fba58-4731-4d2f-a521-169591e893a2 (old id 910616)
- date added to LUP
- 2016-04-01 16:52:51
- date last changed
- 2022-04-23 01:00:28
@article{6f1fba58-4731-4d2f-a521-169591e893a2,
abstract = {{We present a general model study of surface-enhanced resonant Raman scattering and fluorescence, focusing on the interplay between electromagnetic (EM) effects and the molecular dynamics as treated by a density matrix calculation. The model molecule has two electronic levels, is affected by radiative and nonradiative damping mechanisms, and a Franck-Condon mechanism yields electron-vibration coupling. The coupling between the molecule and the electromagnetic field is enhanced by placing it between two Ag nanoparticles. The results show that the Raman scattering cross section can, for realistic parameter values, increase by some 10 orders of magnitude (to similar to 10(-14) cm(2)) compared with the free-space case. Also the fluorescence cross section grows with increasing EM enhancement, however, at a slower rate, and this increase eventually stalls when nonradiative decay processes become important. Finally, we find that anti-Stokes Raman scattering is possible with strong incident laser intensities similar to 1 mW/mu m(2).}},
author = {{Johansson, P and Xu, Hongxing and Kall, M}},
issn = {{1098-0121}},
language = {{eng}},
number = {{3}},
publisher = {{American Physical Society}},
series = {{Physical Review B (Condensed Matter and Materials Physics)}},
title = {{Surface-enhanced Raman scattering and fluorescence near metal nanoparticles}},
url = {{http://dx.doi.org/10.1103/PhysRevB.72.035427}},
doi = {{10.1103/PhysRevB.72.035427}},
volume = {{72}},
year = {{2005}},
}