Dual-mode surface-plasmon-resonance sensors using angular interrogation

Jing Guo, P. Donald Keathley, J. T. Hastings

Research output: Contribution to journalArticlepeer-review

92 Scopus citations

Abstract

Surface-plasmon-resonance (SPR) sensors are widely used in biological, chemical, medical, and environmental sensing. SPR sensors supporting two surface-plasmon modes can differentiate surface binding interactions from bulk index changes at a single sensing location. We present a new approach to dual-mode SPR sensing that offers improved differentiation between surface and bulk effects. By using an angular interrogation, both long- and short-range surface plasmons are simultaneously excited at the same location and wavelength but at different angles. Initial experiments indicate that angular interrogation offers at least a factor of 3.6 improvement in surface and bulk cross-sensitivity compared to wavelength-interrogated dual-mode SPR sensors.

Original languageEnglish
Pages (from-to)512-514
Number of pages3
JournalOptics Letters
Volume33
Issue number5
DOIs
StatePublished - Mar 1 2008

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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