✦ LIBER ✦

Measurement of refractive index variation of liquids by surface plasmon resonance and wavelength-modulated heterodyne interferometry

✍ Scribed by Ju-Yi Lee; Shin-Kai Tsai

Publisher: Elsevier Science
Year: 2011
Tongue: English
Weight: 447 KB
Volume: 284
Category: Article
ISSN: 0030-4018
DOI: 10.1016/j.optcom.2010.10.060

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✦ Synopsis

In this study an alternative method based on surface plasmon resonance is proposed for in-situ monitoring of variation in the refractive index of a test sample. A wavelength-modulated light source and an unequal-pathlength optical configuration heterodyne interferometer are used to detect the phase difference change, which can then be used to estimate the change in the refractive index of a test sample. The experimental results demonstrate a phase stability of 0.02°. The resolution power of the refractive index is 1.5 × 10 -6 RIU. This method has several advantages over previously used methods such as simple optical setup, easier operation in real time, and low cost.

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