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Type: 
Journal
Description: 
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 E4 approximation. We also show how polarization …
Publisher: 
American Chemical Society
Publication date: 
1 Jul 2011
Authors: 

Barbara Fazio, Cristiano D’Andrea, Francesco Bonaccorso, Alessia Irrera, Giuseppe Calogero, Cirino Vasi, Pietro Giuseppe Gucciardi, Maria Allegrini, Andrea Toma, Daniele Chiappe, Christian Martella, Francesco Buatier de Mongeot

Biblio References: 
Volume: 5 Issue: 7 Pages: 5945-5956
Origin: 
Acs Nano