Baltog, I., Baibarac, M. & Lefrant, S. (2008) "Single-beam pumped" coherent anti-Stokes Raman scattering on carbon nanotubes thin films excited through surface plasmons. Physica E, 40 2380–2385.
Added by: Laurent Cournède (2016-03-10 21:58:42)
|Type de référence: Article
Numéro d'identification (ISBN etc.): 1386-9477
Clé BibTeX: Baltog2008
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Mots-clés: anti-stokes Raman scattering, carbon nanotubes, cars, d-band, graphite, sers, spectra, spectroscopy
Créateurs: Baibarac, Baltog, Lefrant
Collection: Physica E
Consultations : 6/461
Indice de consultation : 1%
Indice de popularité : 0.25%
In this paper, we propose an interpretation for an abnormal anti-Stokes Raman emission observed on nanometric thin films of different materials and in particular carbon nanotubes. We demonstrate that under a tight-focusing of the excitation light, a coherent anti-stokes Raman scattering (CARS) emission is produced, resulting from a wave mixing process between the incident laser light (omega(1)) and Stokes Raman light (omega(s)) generated by a surface enhanced Raman scattering (SERS) mechanism. Although the Stokes/anti-Stokes intensity ratio has been explained differently, we present here the results which corroborate the CARS emission. They can be summarized as follows: (i) a square relationship between the CARS signal intensity and the film thickness; (ii) a square relationship between the CARS signal intensity and the exciting laser intensity; (iii) a dependence of the CARS intensity on the numerical aperture (NA) of the microscope objective used for the detection of the anti-Stokes emission. Such effects are not specific to carbon nanotubes and have been observed with other materials accommodated in similar conditions on rough metallic surfaces acting as SERS supports. (c) 2007 Elsevier B.V. All rights reserved.
Added by: Laurent Cournède