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Proceedings Paper

Impact of surface roughness on the sensitivity enhancement of a nanowire-based surface plasmon resonance biosensor
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Paper Abstract

In this study, we investigated the impact of surface roughness on the sensitivity of conventional and nanowire-based surface plasmon resonance (SPR) biosensors. The theoretical research was conducted using rigorous coupled-wave analysis with Gaussian surface profiles of gold films determined by atomic force microscopy. The results suggest that, when surface roughness ranges 1 nm, the sensitivity of a conventional SPR system is not significantly affected regardless of the correlation length. For a nanowire-based SPR biosensor, however, we found that the sensitivity degrades substantially with a decreasing correlation length. Particularly, at a correlation length smaller than 100 nm, random rough surface may induce destructive coupling between excited localized surface plasmons, which can lead to prominent reduction of sensitivity enhancement.

Paper Details

Date Published: 14 February 2007
PDF: 7 pages
Proc. SPIE 6450, Plasmonics in Biology and Medicine IV, 64500P (14 February 2007); doi: 10.1117/12.699949
Show Author Affiliations
Kyung Min Byun, Seoul National Univ. (South Korea)
Soon Joon Yoon, Yonsei Univ. (South Korea)
Donghyun Kim, Yonsei Univ. (South Korea)
Sung June Kim, Seoul National Univ. (South Korea)


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

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