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Proceedings Paper

Plasmonic engineering of silver films for enhanced fluorescence and Raman scattering
Author(s): Nic Cade; Tom Ritman-Meer; David Richards
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Paper Abstract

We have investigated the effects of tuning the localized surface plasmon resonance (LSPR) of a silver film on the extinction spectrum, Raman signal, and fluorescence intensity from nearby fluorophores. We observe the formation of hybridized modes due to strong coupling between the plasmonic and molecular excitations. The Raman spectra of R6G on these films show an enhancement of many orders of magnitude due to surface enhanced scattering mechanisms; we find a maximum signal when a hybridized mode lies in the middle of the Stokes shifted emission band. The effect of fluorophore-film separation on fluorescence intensity has been investigated using an alumina spacer layer. An enhancement in detected signal of up to 18× is observed relative to that detected from a bare Ag film. Overall, we observe a greater than 40× increase in detected intensity from the alumina-coated Ag film relative to fluorophores on glass; this is a result of increased collection efficiency and a greater radiative emission rate.

Paper Details

Date Published: 17 February 2009
PDF: 7 pages
Proc. SPIE 7192, Plasmonics in Biology and Medicine VI, 71920J (17 February 2009); doi: 10.1117/12.807845
Show Author Affiliations
Nic Cade, King's College London (United Kingdom)
Tom Ritman-Meer, King's College London (United Kingdom)
David Richards, King's College London (United Kingdom)

Published in SPIE Proceedings Vol. 7192:
Plasmonics in Biology and Medicine VI
Tuan Vo-Dinh; Joseph R. Lakowicz, Editor(s)

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