Re-radiation Enhancement in Polarized Surface-Enhanced Resonant Raman Scattering of Randomly Oriented Molecules on Self-Organized Gold Nanowires (Articolo in rivista)

Type
Label
  • Re-radiation Enhancement in Polarized Surface-Enhanced Resonant Raman Scattering of Randomly Oriented Molecules on Self-Organized Gold Nanowires (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • Fazio, B; D'Andrea, C; Bonaccorso, F; Irrera, A; Calogero, G; Vasi, C; Gucciardi, PG; Allegrini, M; Toma, A; Chiappe, D; Martella, C; de Mongeot, FB (2011)
    Re-radiation Enhancement in Polarized Surface-Enhanced Resonant Raman Scattering of Randomly Oriented Molecules on Self-Organized Gold Nanowires
    in ACS nano
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Fazio, B; D'Andrea, C; Bonaccorso, F; Irrera, A; Calogero, G; Vasi, C; Gucciardi, PG; Allegrini, M; Toma, A; Chiappe, D; Martella, C; de Mongeot, FB (literal)
Pagina inizio
  • 5945 (literal)
Pagina fine
  • 5956 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 5 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR, IPCF, I-98156 Messina, Italy Univ Pisa, Dipartimento Fis Enrico Fermi, I-56126 Pisa, Italy INO CNR, Sez Pisa, I-56126 Pisa, Italy Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy CNISM, I-16146 Genoa, Italy (literal)
Titolo
  • Re-radiation Enhancement in Polarized Surface-Enhanced Resonant Raman Scattering of Randomly Oriented Molecules on Self-Organized Gold Nanowires (literal)
Abstract
  • We explore the effect of re-radiation in surface-enhanced Raman scattering (SERS) through polarization-sensitive experiments on self-organized gold nanowires on which randomly oriented Methylene Blue molecules are adsorbed. We provide the exact laws ruling the polarized, unpolarized, and parallel- and cross-polarized SERS Intensity as a function of the field polarizations. We show that SERS is polarized along the wire-to-wire nanocavity axis, independently from the excitation polarization. This proves the selective enhancement of the Raman dipole component parallel to the nanocavity at the single molecule level. Introducing a field enhancement tensor to account for the anisotropic polarization response of the nanowires, we work out a model that correctly predicts the experimental results for any excitation/detection polarization and goes beyond the E(4) approximation. We also show how polarization-sensitive SERS experiments permit one to evaluate independently the excitation and the re-radiation enhancement factors accessing the orientation-averaged non-diagonal components of the molecular Raman polarizability tensor. (literal)
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