TY - GEN
T1 - Impact of surface roughness on the sensitivity enhancement of a nanowire-based surface plasmon resonance biosensor
AU - Byun, Kyung Min
AU - Yoon, Soon Joon
AU - Kim, Donghyun
AU - Kim, Sung June
PY - 2007
Y1 - 2007
N2 - 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.
AB - 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.
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U2 - 10.1117/12.699949
DO - 10.1117/12.699949
M3 - Conference contribution
AN - SCOPUS:34247402095
SN - 0819465631
SN - 9780819465634
T3 - Progress in Biomedical Optics and Imaging - Proceedings of SPIE
BT - Plasmonics in Biology and Medicine IV
T2 - Plasmonics in Biology and Medicine IV
Y2 - 23 January 2007 through 23 January 2007
ER -