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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish
Title of host publicationPlasmonics in Biology and Medicine IV
DOIs
Publication statusPublished - 2007 Apr 30
EventPlasmonics in Biology and Medicine IV - San Jose, CA, United States
Duration: 2007 Jan 232007 Jan 23

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume6450
ISSN (Print)1605-7422

Other

OtherPlasmonics in Biology and Medicine IV
CountryUnited States
CitySan Jose, CA
Period07/1/2307/1/23

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging

Cite this

Byun, K. M., Yoon, S. J., Kim, D., & Kim, S. J. (2007). Impact of surface roughness on the sensitivity enhancement of a nanowire-based surface plasmon resonance biosensor. In Plasmonics in Biology and Medicine IV [64500P] (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 6450). https://doi.org/10.1117/12.699949