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

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Authors
Byun, Kyung Min; Yoon, Soon Joon; Kim, Donghyun; Kim, Sung June
Issue Date
2007-01-20
Publisher
International Society for Optical Engineering (SPIE)
Citation
SPIE Photonics West, San Jose, California USA, 20-25 January 2007
Keywords
Localized surface plasmon resonancebiosensorsmetallic nanowiressurface roughnesssensitivity enhancement
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.
Language
English
URI
http://hdl.handle.net/10371/7727
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Others_전기·정보공학부
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