Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 404, Issue 10, Pages 2859-2868Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-012-6195-0
Keywords
Localized and propagating surface plasmons; Enhanced sensitivity; Angle-dependent amplification; Surface-enhanced Raman scattering; Biosensing; Microhole arrays
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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.
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