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

Ikehata, Akifumi; Xiaoling Li; Itoh, Tamitake; Ozaki, Yukihiro; Jian-Hui Jiang
September 2003
Applied Physics Letters;9/15/2003, Vol. 83 Issue 11, p2232
Academic Journal
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[sup -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 et al. [Appl. Opt. 33, 5166 (1994)]. These experimental results are mathematically well reproduced by use of Fresnel multiple-reflection theory. © 2003 American Institute of Physics.


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