Stokes/anti-Stokes anomalies under surface enhanced Raman scattering conditions

Stokes/anti-Stokes anomalies under surface enhanced Raman scattering conditions

The possibility of achieving anti-Stokes stimulation and/or pumping under surface enhanced Raman scattering conditions has been the source of intense controversies in the literature. With the aim of clarifying some of the aspects of this problem, we study theoretically and experimentally the situati...

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Veröffentlicht in:The Journal of chemical physics 2004-06, Vol.120 (24), p.11746-11753
Hauptverfasser: Maher, R C, Cohen, L F, Etchegoin, P, Hartigan, H J N, Brown, R J C, Milton, M J T
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container_end_page 11753
container_issue 24
container_start_page 11746
container_title The Journal of chemical physics
container_volume 120
creator Maher, R C
Cohen, L F
Etchegoin, P
Hartigan, H J N
Brown, R J C
Milton, M J T
description The possibility of achieving anti-Stokes stimulation and/or pumping under surface enhanced Raman scattering conditions has been the source of intense controversies in the literature. With the aim of clarifying some of the aspects of this problem, we study theoretically and experimentally the situation in a model system which highlights some of the difficulties in the interpretation of the data. We show that many of the assumptions often presumed in the literature need to be assessed with care in each case. Through careful experiments we show, in particular, that the anti-Stokes/Stokes ratio for a specific mode in the same sample can depend on the chosen laser wavelength. This latter effect is a manifestation of the influence of the internal plasmon resonances (hot spots) in the result. Different possibilities and further research directions are highlighted and discussed.
doi_str_mv 10.1063/1.1739398
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title Stokes/anti-Stokes anomalies under surface enhanced Raman scattering conditions
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