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

Kyung Min Byun; Soon Joon Yoon; Donghyun Kim; Sung June Kim

doi:10.1117/12.699949

14 February 2007 Impact of surface roughness on the sensitivity enhancement of a nanowire-based surface plasmon resonance biosensor

Kyung Min Byun, Soon Joon Yoon, Donghyun Kim, Sung June Kim

Author Affiliations +

Proceedings Volume 6450, Plasmonics in Biology and Medicine IV; 64500P (2007) https://doi.org/10.1117/12.699949
Event: SPIE BiOS, 2007, San Jose, California, United States

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.

Citation Download Citation

Kyung Min Byun, Soon Joon Yoon, Donghyun Kim, and Sung June Kim "Impact of surface roughness on the sensitivity enhancement of a nanowire-based surface plasmon resonance biosensor", Proc. SPIE 6450, Plasmonics in Biology and Medicine IV, 64500P (14 February 2007); https://doi.org/10.1117/12.699949

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