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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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
Issue number10
Publication statusPublished - Dec 2012



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

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