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Since its discovery, surface-enhanced Raman spectroscopy (SERS) has pushed researchers’ interest to develop different kinds of active substrates for high sensitivity molecular detection. Defocused ion beam sputtering (IBS) represents a viable route for the production of large scale, highly reproducible SERS-active substrates consisting of near-field coupled nanowires featuring localized surface plasmon resonances in the visible and the near-infrared. Here we investigate the field enhancement and spatial confinement in the visible and the near-infrared of arrays of optically resonant gold nanowires, using two complementary techniques: SERS and scanning near-field optical microscopy (SNOM). While SERS allows us to quantify the field enhancement factor, SNOM is used to image the localization of the enhanced electromagnetic fields. We show that in the visible (633 nm) the nanowires are SERS active only for …
American Chemical Society
Publication date: 
24 Apr 2014

C D’Andrea, B Fazio, PG Gucciardi, MC Giordano, C Martella, D Chiappe, A Toma, F Buatier de Mongeot, Francesco Tantussi, P Vasanthakumar, Francesco Fuso, Maria Allegrini

Biblio References: 
Volume: 118 Issue: 16 Pages: 8571-8580
The Journal of Physical Chemistry C