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Issue 18, 2012
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EOT or Kretschmann configuration? Comparative study of the plasmonic modes in gold nanohole arrays

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Abstract

The debate is still ongoing on the optimal mode of interrogation for surface plasmon resonance (SPR) sensors. Comparative studies previously demonstrated that nanoparticles exhibiting a localized SPR (LSPR) have superior sensitivity to molecular adsorption processes while thin Au film-based propagating SPR is more sensitive to bulk refractive index. In this paper, it is demonstrated that nanohole arrays (1000 nm periodicity, 600 nm diameter and 125 nm depth), which support both LSPR and propagating SPR modes, exhibited superior sensitivity to bulk refractive index and improved detection limits for IgG sensing by using the Kretschmann configuration. The greater sensitivity to IgG detection in the Kretschmann configuration was obtained despite the shorter penetration depth of nanohole arrays excited in the enhanced optical transmission (EOT) configuration. The decay length of the electromagnetic field in EOT mode was estimated to be approximately 140 nm using a layer-by-layer deposition technique of polyelectrolytes (PAH and PSS) and was confirmed with 3D FDTD simulations, which was lengthen by almost a factor of two in the Kretschmann configuration. Spectroscopic data and field depth were correlated with RCWA and FDTD simulations, which were in good agreement with the experimental results. Considering these analytical parameters, it is advantageous to develop sensors based on nanohole arrays in the Kretschmann configuration of SPR.

Graphical abstract: EOT or Kretschmann configuration? Comparative study of the plasmonic modes in gold nanohole arrays

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Publication details

The article was received on 30 Apr 2012, accepted on 05 Jul 2012 and first published on 06 Jul 2012


Article type: Paper
DOI: 10.1039/C2AN35566C
Citation: Analyst, 2012,137, 4162-4170
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    EOT or Kretschmann configuration? Comparative study of the plasmonic modes in gold nanohole arrays

    M. Couture, L. S. Live, A. Dhawan and J. Masson, Analyst, 2012, 137, 4162
    DOI: 10.1039/C2AN35566C

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