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Effect of the nanowire cross-section on the sensitivity enhancement of localized surface plasmon resonance biosensors

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Authors
Byun, Kyung Min; Kim, Sung June; Kim, Donghyun
Issue Date
2006-01-24
Publisher
International Society for Optical Engineering (SPIE)
Citation
SPIE Internarional Symposium BiOS 2006, San Jose, California USA, 21-26 January 2006
Keywords
Surface plasmon resonancebiosensorsnanowiresrigorous coupled wave analysis
Abstract
In this study, localized surface plasmon resonance (SPR) biosensors with gold nanowires regularly patterned on a gold
film are considered for sensitivity enhancement. The theoretical investigation was conducted using rigorous coupled
wave analysis (RCWA) in terms of various design metrics, such as the resonance angle shift, the SPR curve angular
width (SPR CAW), and the minimum reflectance at resonance (MRR). Especially, when LSP modes couple resonantly,
broad SPR CAW and shallow MRR as well as a large shift of the resonance angle can be observed due to absorptive
damping and localized coupling. The results show that, in general, nanowires of a T-profile present more effective
sensitivity enhancement than an inverse T-profile. The sensitivity enhancement mediated by the presence of nanowires
has been clarified qualitatively based on the dispersion relation between metal film involving nanowires and surrounding
dielectric medium. Moreover, optimal design parameters of nanowires are determined based on quantitative metrics that
measure the sensor performance and the fabrication reliability.
Language
English
URI
http://hdl.handle.net/10371/7713
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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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