Enhanced sensitivity to surface plasmon resonance phase in wavelength-modulated heterodyne interferometry

Ju Yi Lee, Li Wei Mai, Cheng Chih Hsu, Yuan Yuan Sung

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

An alternative wavelength-modulated heterodyne interferometry based on surface plasmon resonance is proposed for in-situ monitoring of variations in the refractive index of a test sample. Phase variations in surface plasmon resonance are detected by the heterodyne detection system, which uses a wavelength-modulated light source and an unequal-path-length optical configuration. The measurement sensitivity and resolution of the refractive index are greatly enhanced by inserting a quarter-wave plate with a suitable azimuthal angle in front of the SPR sensor. The experimental results indicate that the resolution is better than 3×10-7 RIU.

Original languageEnglish
Pages (from-to)28-32
Number of pages5
JournalOptics Communications
Volume289
DOIs
StatePublished - 15 Feb 2013

Keywords

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

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