Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali (Sep 2011)

Light depolarization effects in tip enhanced Raman spectroscopy of silicon (001) and gallium arsenide (001)

  • P. G. Gucciardi,
  • J.-C. Valmalette,
  • M. Lopes,
  • R. Deturche,
  • M. Lamy de la Chapelle,
  • D. Barchiesi,
  • F. Bonaccorso,
  • C. D'Andrea,
  • M. Chaigneau,
  • G. Picardi,
  • R. Ossikovski

DOI
https://doi.org/10.1478/C1V89S1P042
Journal volume & issue
Vol. 89, no. S1
pp. C1V89S1P042 – 1

Abstract

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We report on the effects of light depolarization induced by sharp metallic tips in Tip-Enhanced Raman Spectroscopy (TERS). Experiments on Si(001) and GaAs(001) crystals show that the excitation field depolarization induces a selective enhancement of specific Raman modes, depending on their Raman tensor symmetry. A complete polarization analysis of the light backscattered from the tip confirms the TERS findings. The spatial confinement of the depolarization field is studied and its dependence on the excitation wavelength and power are explored.