Measurement of wavelength shift by using surface plasmon resonance heterodyne interferometry
- 1 August 2002
- journal article
- research article
- Published by Elsevier BV in Optics Communications
- Vol. 209 (1-3), 167-172
- https://doi.org/10.1016/s0030-4018(02)01641-3
Abstract
A linearly polarized light is incident on a surface plasmon resonance (SPR) apparatus at the resonant angle, the surface plasmons are excited. Small wavelength shifts will introduce phase difference variations between s- and p-polarizations of the reflected light. These phase difference variations can be measured accurately by using heterodyne interferometry. Based on these facts, a novel method for measuring small wavelength shifts is proposed. It has the advantages of both common-path interferometry and heterodyne interferometry.Keywords
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