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Proceedings Paper

Theory of surface-enhanced Raman scattering from a molecule adsorbed on a cluster of metallic nanoparticles and nanoshells
Author(s): Jeanne Bonner; Rosstin Brian Murphy; Karamjeet Arya
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Paper Abstract

The Raman cross-section from a molecule is believed to enhance by more than 10 orders of magnitude when it is adsorbed on a cluster of silver nanoparticles. These large enhancements are attributed to the resonant excitation of the surface plasmon modes of the cluster those have very large localized electric field near its surface. The resonant position and the electric field of these modes are very sensitive to the structure of metal particles and the size and shape of the cluster. Using multiple scattering in the wave-vector space between the individual particles in the cluster we have calculated the resonant position of these modes and their enhanced electric field for clusters of different shape formed from two, three, and four nanospheres and nanoshells. We find the maximum enhancement in the cross-section can reach up to 10 orders of magnitude for silver particle clusters. We also find important new results for the chain like clusters of three or more particles where there is a dramatic increase in the enhancement due to very sharp resonant features of the modes. These features may be helpful in identifying the cluster shape and size in the surface enhanced Raman scattering experiments.

Paper Details

Date Published: 23 February 2007
PDF: 12 pages
Proc. SPIE 6450, Plasmonics in Biology and Medicine IV, 645002 (23 February 2007); doi: 10.1117/12.699610
Show Author Affiliations
Jeanne Bonner, San Jose State Univ. (United States)
Rosstin Brian Murphy, Univ. of California, Davis (United States)
Karamjeet Arya, San Jose State Univ. (United States)

Published in SPIE Proceedings Vol. 6450:
Plasmonics in Biology and Medicine IV
Tuan Vo-Dinh; Joseph R. Lakowicz, Editor(s)

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