Journal
OPTICS COMMUNICATIONS
Volume 289, Issue -, Pages 28-32Publisher
ELSEVIER
DOI: 10.1016/j.optcom.2012.10.005
Keywords
Wavelength-modulated heterodyne interferometry; Surface plasmon resonance; Refractive index
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Funding
- National Science Council, Taiwan [NSC 100-2221-E-008-074-MY3]
- Central Taiwan Science Park Administration [302201802]
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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 x 10(-7) RIU. (C) 2012 Elsevier B.V. All rights reserved.
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