Angle-dependent resonance of localized and propagating surface plasmons in microhole arrays for enhanced biosensing

Ludovic S. Live, Anuj Dhawan, Kirsty F. Gibson, Hugo-Pierre Poirier-Richard, Duncan Graham, Michael Canva, Tuan Vo-Dinh, Jean-Francois Masson

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26 Citations (Scopus)

Abstract

The presence of microhole arrays in thin Au films is suited for the excitation of localized and propagating surface plasmon (SP) modes. Conditions can be established to excite a resonance between the localized and propagating SP modes, which further enhanced the local electromagnetic (EM) field. The co-excitation of localized and propagating SP modes depends on the angle of incidence (theta (exc)) and refractive index of the solution interrogated. As a consequence of the enhanced EM field, enhanced sensitivity and an improved response for binding events by about a factor of 3 to 5 was observed with SPR sensors in the Kretschmann configuration for a set of experimental conditions (lambda (SPR), theta (exc), and eta). Thus, microhole arrays can improve sensing applications of SPR based on classical prism-based instrumentation and are suited for SP-coupled spectroscopic techniques.

Original languageEnglish
Pages (from-to)2859-2868
Number of pages10
JournalAnalytical and Bioanalytical Chemistry
Volume404
Issue number10
DOIs
Publication statusPublished - Dec 2012

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Keywords

  • surface plasmon
  • microhole arrays
  • biosensing
  • enhanced sensitivity
  • angle dependent amplification

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