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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 3 — Mar. 7, 2007

Sensitivity analysis of a nanowire-based surface plasmon resonance biosensor in the presence of surface roughness

Kyung Min Byun, Soon Joon Yoon, Donghyun Kim, and Sung June Kim  »View Author Affiliations


JOSA A, Vol. 24, Issue 2, pp. 522-529 (2007)
http://dx.doi.org/10.1364/JOSAA.24.000522


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Abstract

We have investigated the effect 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 near 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 have found that the sensitivity degrades substantially with decreasing correlation length. In particular, at a correlation length smaller than 100 nm , a random rough surface may induce destructive coupling between excited localized surface plasmons, which can lead to prominent reduction of sensitivity enhancement.

© 2007 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(130.6010) Integrated optics : Sensors
(240.0310) Optics at surfaces : Thin films
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Optics at Surfaces

History
Original Manuscript: July 14, 2006
Manuscript Accepted: August 16, 2006

Virtual Issues
Vol. 2, Iss. 3 Virtual Journal for Biomedical Optics

Citation
Kyung Min Byun, Soon Joon Yoon, Donghyun Kim, and Sung June Kim, "Sensitivity analysis of a nanowire-based surface plasmon resonance biosensor in the presence of surface roughness," J. Opt. Soc. Am. A 24, 522-529 (2007)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=josaa-24-2-522


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