ATR FT-IR absorption enhancement of a thin film under the photon-tunneling condition

Ekgasit, Sanong, Vongsvivut, Jitraporn and Thongnopkun, Pimthong 2007, ATR FT-IR absorption enhancement of a thin film under the photon-tunneling condition, Analytical sciences, vol. 23, no. 7, pp. 847-851.

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Title ATR FT-IR absorption enhancement of a thin film under the photon-tunneling condition
Author(s) Ekgasit, Sanong
Vongsvivut, Jitraporn
Thongnopkun, Pimthong
Journal name Analytical sciences
Volume number 23
Issue number 7
Start page 847
End page 851
Publisher Japan Society for Analytical Chemistry
Place of publication Tokyo, Japan
Publication date 2007
ISSN 1348-2246
Summary A simple, yet very powerful technique for the spectral acquisition of an extremely thin film with enhanced absorption was explored. An infrared absorption of an extremely thin film confined between media of high refractive indices was greater than that of its bulk when the spectrum was acquired under the attenuated total reflection (ATR) condition with parallel (p) polarized radiation. The absorption enhancement was not observed under perpendicular (s) polarized radiation. Theoretical investigations indicated that the absorption enhancement was proportional to the integration of the mean square evanescent field within the film. The field integration under p-polarized radiation increased, while that under s-polarized radiation decreased as the thickness of the confined film became thinner. The maximum enhancement was observed when the film was sufficiently thinner than the penetration depth. The phenomena were experimentally investigated, and the results agreed very well with theoretical predictions.
Language eng
Field of Research 030101 Analytical Spectrometry
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2007, The Japan Society for Analytical Chemistry
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