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

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 (θexc) 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 (λSPR, θexc, and η). Thus, microhole arrays can improve sensing applications of SPR based on classical prism-based instrumentation and are suited for SP-coupled spectroscopic techniques.
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Submitted on : Friday, January 18, 2013 - 2:24:48 PM
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Ludovic S. Live, Anuj Dhawan, Kirsty F. Gibson, Hugo-Pierre Poirier-Richard, Duncan Graham, et al.. Angle-dependent resonance of localized and propagating surface plasmons in microhole arrays for enhanced biosensing. Analytical and Bioanalytical Chemistry, Springer Verlag, 2012, 404 (10), pp.2859-2868. ⟨10.1007/s00216-012-6195-0⟩. ⟨hal-00777961⟩

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