Performance analysis of extinction-based localized surface plasmon resonance biosensors in the presence of surface roughness

Kyung Min Byun, Soon Joon Yoon, Donghyun Kim

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

1 Citation (Scopus)


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

Original languageEnglish
Title of host publicationPlasmonics in Biology and Medicine VI
Publication statusPublished - 2009 Jun 12
EventPlasmonics in Biology and Medicine VI - San Jose, CA, United States
Duration: 2009 Jan 262009 Jan 27


OtherPlasmonics in Biology and Medicine VI
CountryUnited States
CitySan Jose, CA


All Science Journal Classification (ASJC) codes

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

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