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Measurement of refractive index change by surface plasmon resonance and phase quadrature interferometry

โœ Scribed by Ju-Yi Lee; Hsueh-Ching Shih; Cyun-Tai Hong; Teng Ko Chou

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
194 KB
Volume
276
Category
Article
ISSN
0030-4018

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โœฆ Synopsis

The phase difference change between the s and p polarization lights in surface plasmon resonance sensing systems is strongly influenced by the refractive index of the test sample. In this paper, the phase difference change, measured by common-path phase quadrature interferometry, can be used to estimate the refractive index change. In the experimental results we obtain a phase stability of 0.07ยฐ, and a resolving power for the refractive index of 6 โ€ข 10 ร€6 RIU. This method has the advantages of a simple optical setup, being easier to operate in real time, and low cost. In addition, due to the common-path arrangement, our method can also eliminate the surrounding noise.

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