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High sensitive detection of near-infrared absorption by surface plasmon resonance

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5 Author(s)
Ikehata, Akifumi ; Department of Chemistry and Research Center for Near Infrared Spectroscopy, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, 669-1337, Japan ; Li, Xiaoling ; Itoh, Tamitake ; Ozaki, Yukihiro
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In this letter we report on an operative method for high sensitive measurement of near-infrared absorption based on a surface plasmon resonance (SPR) technique. By coupling with the SPR of a gold film, an absorption band of water near 5173 cm-1 assigned to a combination of the stretching and bending modes of OH groups is enhanced over 100 times compared with a case without the gold film. In addition, positive and negative enhancements of an absorption depending on the thickness of a gold film were observed as predicted by H. Kano etal [Appl. Opt. 33, 5166 (1994)]. These experimental results are mathematically well reproduced by use of Fresnel multiple-reflection theory. © 2003 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:83 ,  Issue: 11 )

Date of Publication:

Sep 2003

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