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

Ju Yi Lee, Shin Kai Tsai

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

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-path-length 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.

Original languageEnglish
Pages (from-to)925-929
Number of pages5
JournalOptics Communications
Volume284
Issue number4
DOIs
StatePublished - 15 Feb 2011

Keywords

  • Refractive index
  • Surface plasmon resonance
  • Wavelength-modulated heterodyne

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