S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Electrical and Computer Engineering (전기·정보공학부) Journal Papers (저널논문_전기·정보공학부)
Sensitivity Analysis of a Nanowire-Based Surface Plasmon Resonance Biosensor in the Presence of Surface roughness
- Byun, Kyung Min; Kim, Sung June; Yoon, Soon Joon; Kim, Dong Hyun
- Issue Date
- Optical Society of America
- J. Opt. Soc. Am. A 24, 522-529 (2007)
- 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 coupledwave
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.
- 1084-7529 (print)
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