Depolarization effects in tip-enhanced Raman Spectroscopy (Articolo in rivista)

Type
Label
  • Depolarization effects in tip-enhanced Raman Spectroscopy (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • Merlen, A; Valmalette, JC; Gucciardi, PG; de la Chapelle, ML; Frigout, A; Ossikovski, R (2009)
    Depolarization effects in tip-enhanced Raman Spectroscopy
    in Journal of Raman spectroscopy
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Merlen, A; Valmalette, JC; Gucciardi, PG; de la Chapelle, ML; Frigout, A; Ossikovski, R (literal)
Pagina inizio
  • 1361 (literal)
Pagina fine
  • 1370 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 40 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • DOI 10.1002/jrs.2424 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Sud Toulon Var, IM2NP, F-83957 La Garde, France CNRS, IM2NP, UMR 6242, F-75700 Paris, France CNR, Ist Proc Chim Fis, Sez Messina, I-98158 Messina, Italy Univ Paris 13, UFR SMBH, Lab Chim Struct & Proprietes Biomat & Agents Ther, F-93017 Bobigny, France Ecole Polytech, CNRS, LPICM, F-91128 Palaiseau, France (literal)
Titolo
  • Depolarization effects in tip-enhanced Raman Spectroscopy (literal)
Abstract
  • Tip-enhanced Raman spectroscopy has proven to be a promising technique for stress/strain mapping of silicon-based semiconductor devices on the nanometer scale. Field enhancement factors of up to 104 have been reported and a spatial resolution down to 20 nm has been claimed through exploiting far-field suppression techniques based on an appropriate choice of the excitation/detection polarization states. In this paper, we show that depolarization of light due to scattering from the tip plays a key role in the selective enhancement of the one-phonon optical mode peak at 520 cm(-1) with respect to the two-phonon ones. The spatial confinement of the selective enhancement has been studied by means of approach curves, and its dependence on the excitation wavelength and power further explored. Conclusions on the physical nature of the enhancement (depolarization- or plasmonic-based) are presented. (literal)
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