Revisiting Surface-Enhanced Raman Scattering on Realistic Lithographic Gold Nanostripes.

ABSTRACT: In this article, we investigate the Surface-Enhanced Raman Scattering (SERS) efficiency of methylene blue (MB) molecules deposited on gold nanostripes which, due to their fabrication by electron beam lithography and thermal evaporation, present various degrees of crystallinity and nanoscale surface roughness (NSR). By comparing gold nanostructures with different degrees of roughness and crystallinity, we show that the NSR has a strong effect on the SERS intensity of MB probe molecules. In particular, the NSR features of the lithographic structures significantly enhance the Raman signal of MB molecules, even when the excitation wavelength lies far from the localized surface plasmon resonance (LSPR) of the stripes. These results are in very good agreement with numerical calculations of the S

SUBMITTER: Sow I 

PROVIDER: S-EPMC3856770 | biostudies-literature | 2013 Dec

REPOSITORIES: biostudies-literature