http://www.cnr.it/ontology/cnr/individuo/prodotto/ID40355
Different longitudinal optical - transverse optical mode amplification in tip enhanced Raman spectroscopy of GaAs(001) (Articolo in rivista)
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- Different longitudinal optical - transverse optical mode amplification in tip enhanced Raman spectroscopy of GaAs(001) (Articolo in rivista) (literal)
- Anno
- 2010-01-01T00:00:00+01:00 (literal)
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- Gucciardi P. G.; Valmalette J.-C. (literal)
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- ISI Web of Science (WOS) (literal)
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- CNR Ist Proc Chim Fis, I-98158 Messina, Italy
Univ Sud Toulon Var, F-83957 La Garde, France
CNRS, IM2NP, UMR 6242, F-83957 La Garde, France (literal)
- Titolo
- Different longitudinal optical - transverse optical mode amplification in tip enhanced Raman spectroscopy of GaAs(001) (literal)
- Abstract
- We report on tip enhanced Raman spectroscopy of GaAs(100) crystals taking advantage of the fields polarization to maximize the near-field contrast. Excitation parallel to either the [100] or the [110] crystallographic axis provide minimum far-field background provided that cross-or parallel-component of the Raman field are detected. Experiments highlight a tip-induced selective enhancement of the one-phonon longitudinal optical mode with respect to the transverse optical mode. We interpret this effect in terms of depolarization of the excitation field and beam deflection which breaks the polarization-based selection rules of the Raman scattering. (literal)
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