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Applied Spectroscopy

Applied Spectroscopy

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  • Vol. 62, Iss. 5 — May. 1, 2008
  • pp: 512–516

Direct Determination of the Experimentally Observed Penetration Depth of the Evanescent Field via Near-Infrared Absorptions Enhanced by the Off-Resonance of Surface Plasmons

Akifumi Ikehata, Kazuaki Ohara, and Yukihiro Ozaki

Applied Spectroscopy, Vol. 62, Issue 5, pp. 512-516 (2008)


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Abstract

Recently, absorption-sensitive surface plasmon resonance (SPR) techniques have attracted much attention. SPR near-infrared spectroscopy (SPR-NIRS) based on the Kretschmann configuration is one of the techniques for absorption enhancement. The enhanced spectrum obtained by SPR-NIRS basically corresponds to the measurement of an NIR absorption spectrum with a very short path length. However, the path length cannot be applied for Lambert's law due to the enhanced evanescent field. A direct determination of the penetration depth of the evanescent field is carried out via NIR absorptions enhanced by the off-resonance of surface plasmons, which is a principle of SPR-NIRS. The signal intensities of the enhanced NIR spectra of micrometer-thick polymer films having various thicknesses are compared with the classic theory of penetration depth. It is confirmed that the effective depth of the SPR-NIRS measurement can be expressed by the classic theory of penetration depth of the evanescent field proposed by Harrick.

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Citation
Akifumi Ikehata, Kazuaki Ohara, and Yukihiro Ozaki, "Direct Determination of the Experimentally Observed Penetration Depth of the Evanescent Field via Near-Infrared Absorptions Enhanced by the Off-Resonance of Surface Plasmons," Appl. Spectrosc. 62, 512-516 (2008)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-62-5-512


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