Surface-enhanced Raman scattering from semi-continuous silver film templates etched by focused ion beams

Bhanu Prakash; Dhamodaran Santhanagopalan

doi:10.1117/1.3502030

1 September 2010 Surface-enhanced Raman scattering from semi-continuous silver film templates etched by focused ion beams

Bhanu Prakash, Dhamodaran Santhanagopalan

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Journal of Nanophotonics, Vol. 4, Issue 1, 049504 (September 2010). https://doi.org/10.1117/1.3502030

Abstract

Semi-continuous silver film templates are fabricated by focused ion beams (FIB), and surface-enhanced Raman scattering spectra from C60-fullerene deposited on these templates are recorded. Films of silver deposited by thermal evaporation are dry-etched by the ion beams with various etching times. The films tend to become semi-continuous as the etch-time increases. The Raman spectra of C60 show an increase in intensity upon correction with a silver coverage area for increasing etch-times. Increase in Raman intensity is due to the sharp edges of the FIB-etched semi-continuous templates, and the moderate enhancements are attributed to dissipation induced by gallium incorporation. A maximum enhancement factor of about 4×106 is observed, which is comparable with other experimental values. Controlling gallium incorporation during processing or by post processing treatments is being explored, which can help increase the enhancement factor.

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Bhanu Prakash and Dhamodaran Santhanagopalan "Surface-enhanced Raman scattering from semi-continuous silver film templates etched by focused ion beams," Journal of Nanophotonics 4(1), 049504 (1 September 2010). https://doi.org/10.1117/1.3502030

Published: 1 September 2010

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