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Optical Engineering

Measurement of the concentration of a solution with surface plasmon resonance heterodyne interferometry
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Paper Abstract

A linearly polarized light beam is incident on the boundary surface between the thin metal film of a surface plasmon resonance (SPR) apparatus and the tested solution. If the incident angle is very near to the resonant angle, then the phase difference between p- and s-polarizations of the reflected light is changed with the concentration of the solution. The phase difference can be measured accurately by heterodyne interferometry. Based on these effects, a method for measuring the concentration of a solution is presented. Because the reflected light is measured, only a small quantity of the solution is required. In addition, the method has the advantages of both common-path interferometry and heterodyne interferometry.

Paper Details

Date Published: 1 July 2003
PDF: 4 pages
Opt. Eng. 42(7) doi: 10.1117/1.1577115
Published in: Optical Engineering Volume 42, Issue 7
Show Author Affiliations
Kun-Huang Chen, National Chiao Tung Univ. (Taiwan)
Cheng-Chih Hsu, National Chiao Tung Univ. (Taiwan)
Der-Chin Su, National Chiao Tung Univ. (Taiwan)

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