Effect of surface roughness on the extinction-based localized surface plasmon resonance biosensors

Kyung Min Byun, Soon Joon Yoon, Donghyun Kim

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We investigated the effect of surface roughness on the sensor performance of extinction-based localized surface plasmon resonance (LSPR) biosensors. The sensor measures resonance wavelength shifts in transmittance caused by biomolecular interactions that are amplified by periodic nanostructures. The numerical computation was conducted using rigorous coupled-wave analysis with Gaussian random surface profiles. The results suggest that, when a surface has a roughness smaller than 2 nm in height deviation, the sensitivity of a LSPR biosensor is not significantly influenced regardless of correlation length (CL). However, we found that the extinction peak amplitude and curve width are affected substantially by a decrease in CL. At a less than 100 nm CL, surface roughness can induce interference between localized surface plasmons excited by the surface and nanowires, which can lead to major degradation of sensor performance.

Original languageEnglish
Pages (from-to)5886-5892
Number of pages7
JournalApplied Optics
Volume47
Issue number31
DOIs
Publication statusPublished - 2008 Nov 1

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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