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Since the discovery of surface-enhanced Raman scattering (SERS) 40 years ago, the origin of the “background” that is systematically observed in SERS spectra has remained questionable. To deeply analyze this phenomenon, plasmon-resonant Raman scattering was recorded under specific experimental conditions on a panel of composite multilayer samples containing noble metal (Ag and Au) nanoparticles. Stokes, anti-Stokes, and wide, including very low, frequency ranges have been explored. The effects of temperature, size (in the nm range), embedding medium (SiO 2, Si 3 N 4, or TiO 2) or ligands have been successively analyzed. Both lattice (Lamb modes and bulk phonons) and electron (plasmon mode and electron-hole excitations) dynamics have been investigated. This work confirms that in Ag-based nanoplasmonics composite layers, only Raman scattering by single-particle electronic excitations …
American Physical Society
Publication date: 
5 Nov 2015

Robert Carles, Maxime Bayle, Patrizio Benzo, Gérard Benassayag, Caroline Bonafos, G Cacciato, V Privitera

Biblio References: 
Volume: 92 Issue: 17 Pages: 174302
Physical Review B