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Proceedings Paper

Interparticle coupling effects in surface-enhanced Raman scattering
Author(s): Hongxing Xu; Erik J. Bjerneld; Javier Aizpurua; Peter Apell; Linda Gunnarsson; Sarunas Petronis; Bengt Kasemo; Charlotte Larsson; Fredrik Hook; Mikal Kall
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Paper Abstract

We report experimental and theoretical results on the effect of electromagnetic coupling between metal particles in surface-enhanced Raman scattering (SERS). Model calculations of the near-field optical properties of Ag and Au nanoparticle-aggregates show that the electromagnetic surface-enhancement factor can reach 11 orders-of-magnitude in gaps between nearly touching particles. Single particles exhibit a much weaker enhancement, unless the particles contain extremely sharp surface protrusions. Data on spectral fluctuations in single-molecule SERS and measurements on the efficiency of nanofabricated SERS substrates give experimental support for the idea that an efficient interparticle coupling is a necessary requirement for an ultra-high surface-enhancement. We suggest a route for biorecognition induced coupling of metal particles for use in biosensing applications.

Paper Details

Date Published: 18 June 2001
PDF: 8 pages
Proc. SPIE 4258, Nanoparticles and Nanostructured Surfaces: Novel Reporters with Biological Applications, (18 June 2001); doi: 10.1117/12.430771
Show Author Affiliations
Hongxing Xu, Chalmers Univ. of Technology (Sweden)
Erik J. Bjerneld, Chalmers Univ. of Technology (Sweden)
Javier Aizpurua, Chalmers Univ. of Technology (Sweden)
Peter Apell, Chalmers Univ. of Technology (Sweden)
Linda Gunnarsson, Chalmers Univ. of Technology (Sweden)
Sarunas Petronis, Chalmers Univ. of Technology (Sweden)
Bengt Kasemo, Chalmers Univ. of Technology (Sweden)
Charlotte Larsson, Chalmers Univ. of Technology (Sweden)
Fredrik Hook, Chalmers Univ. of Technology (Sweden)
Mikal Kall, Chalmers Univ. of Technology (Sweden)

Published in SPIE Proceedings Vol. 4258:
Nanoparticles and Nanostructured Surfaces: Novel Reporters with Biological Applications
Catherine J. Murphy, Editor(s)

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