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Baltog, I., Baibarac, M., Mihut, L., Smaranda, I. & Lefrant, S. (2012) NONLINEAR OPTICAL PROCESSES MANIFESTING AS ANDERSON LOCALIZATION OF LIGHT IN MESOSCOPIC MATERIALS. Proc. Rom. Acad. Ser. A-Math. Phys. 13 109–117.
Added by: Laurent Cournède (2016-03-10 21:28:39) |
| Type de référence: Article Numéro d'identification (ISBN etc.): 1454-9069 Clé BibTeX: Baltog2012 Voir tous les détails bibliographiques  |
Catégories: PMN Mots-clés: Anderson localization of light, carbon nanotubes, coherent anti-Stokes Raman scattering, coherent backscattering, disordered media, enhanced raman-scattering, microscopy, modes, Raman scattering, spectroscopy, stokes, thin-films Créateurs: Baibarac, Baltog, Lefrant, Mihut, Smaranda Collection: Proc. Rom. Acad. Ser. A-Math. Phys. |
Consultations : 1/557
Indice de consultation : 4% Indice de popularité : 1% |
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Abnormal anti-Stokes Raman emission (AASRE) is defined by an anti-Stokes/Stokes intensity ratio much greater than expected on the basis of the equilibrium population of excited vibration states provided by the Boltzmann law. AASRE can be observed both in materials with intrinsic nonlinear optical properties as LiNbO3 or materials in which the nonlinear optical properties are induced by resonant optical excitation, as carbon nanotubes. Using a surface enhanced Raman scattering (SERS) device, consisting from single wall carbon nanotubes deposited on a rough Au or Ag support and LiNbO3 in form of powder, we demonstrate that under continuous single beam excitation they present AASRE whose properties are similar to a single beam pumped Coherent Anti-Stokes Raman Scattering. AASRE is usually accompanied by a coherent backscattering, it can be considered as Anderson localization of light that results from a wave-mixing mechanism of the incident laser light with a Stokes shifted Raman light produced by a spontaneous Raman light scattering process. The transport of the light inside of sample, giving rise to AASRE and coherent backscattering, is done by an elastic light scattering mechanism.
Added by: Laurent Cournède |