Effect of the nanowire cross-section on the sensitivity enhancement of localized surface plasmon resonance biosensors

Kyung Min Byun, Donghyun Kim, Sung June Kim

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

Abstract

In this study, localized surface plasmon resonance (SPR) biosensors with gold nanowires regularly patterned on a gold film are considered for sensitivity enhancement. The theoretical investigation was conducted using rigorous coupled wave analysis (RCWA) in terms of various design metrics, such as the resonance angle shift, the SPR curve angular width (SPR CAW), and the minimum reflectance at resonance (MRR). Especially, when LSP modes couple resonantly, broad SPR CAW and shallow MRR as well as a large shift of the resonance angle can be observed due to absorptive damping and localized coupling. The results show that, in general, nanowires of a T-profile present more effective sensitivity enhancement than an inverse T-profile. The sensitivity enhancement mediated by the presence of nanowires has been clarified qualitatively based on the dispersion relation between metal film involving nanowires and surrounding dielectric medium. Moreover, optimal design parameters of nanowires are determined based on quantitative metrics that measure the sensor performance and the fabrication reliability.

Original languageEnglish
Title of host publicationPlasmonics in Biology and Medicine III
DOIs
Publication statusPublished - 2006
EventPlasmonics in Biology and Medicine III - San Jose, CA, United States
Duration: 2006 Jan 232006 Jan 24

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume6099
ISSN (Print)1605-7422

Other

OtherPlasmonics in Biology and Medicine III
CountryUnited States
CitySan Jose, CA
Period06/1/2306/1/24

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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  • Cite this

    Byun, K. M., Kim, D., & Kim, S. J. (2006). Effect of the nanowire cross-section on the sensitivity enhancement of localized surface plasmon resonance biosensors. In Plasmonics in Biology and Medicine III [60990T] (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 6099). https://doi.org/10.1117/12.644096