Interparticle coupling effects in surface-enhanced Raman scattering

Hongxing Xu; Erik J. Bjerneld; Javier Aizpurua; Peter Apell; Linda Gunnarsson; Sarunas Petronis; Bengt Kasemo; Charlotte Larsson; Fredrik Hook; Mikal Kall

doi:10.1117/12.430771

18 June 2001 Interparticle coupling effects in surface-enhanced Raman scattering

Hongxing Xu, Erik J. Bjerneld, Javier Aizpurua, Peter Apell, Linda Gunnarsson, Sarunas Petronis, Bengt Kasemo, Charlotte Larsson, Fredrik Hook, Mikal Kall

Author Affiliations +

Proceedings Volume 4258, Nanoparticles and Nanostructured Surfaces: Novel Reporters with Biological Applications; (2001) https://doi.org/10.1117/12.430771
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States

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.

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Hongxing Xu, Erik J. Bjerneld, Javier Aizpurua, Peter Apell, Linda Gunnarsson, Sarunas Petronis, Bengt Kasemo, Charlotte Larsson, Fredrik Hook, and Mikal Kall "Interparticle coupling effects in surface-enhanced Raman scattering", Proc. SPIE 4258, Nanoparticles and Nanostructured Surfaces: Novel Reporters with Biological Applications, (18 June 2001); https://doi.org/10.1117/12.430771

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