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Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 14 — Jul. 15, 2012
  • pp: 2916–2918

Measurement of air refractive index based on surface plasmon resonance and phase detection

Qianghua Chen, Huifu Luo, Sumei Wang, and Feng Wang  »View Author Affiliations

Optics Letters, Vol. 37, Issue 14, pp. 2916-2918 (2012)

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A method for refractive index of air measurement is presented based on surface plasmon resonance (SPR) and phase detection using a dual-frequency laser interferometer. Theoretical analyses indicate that the phase-difference variation of the measurement signal versus the reference signal is linear with refractive index of air (RIA) fluctuation, and the calculation formula of RIA is derived. The structure design of the self-adaptive SPR sensor greatly reduces the measurement error resulting from the incident angle shift and improves the sensitivity. The experiments show that measurement uncertainty of 106 order has been achieved when phase detection precision is 0.1°. The phenomenon of sudden phase variation during air pumping and air filling, which is caused by temperature fluctuation, is discussed.

© 2012 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.4570) Instrumentation, measurement, and metrology : Optical design of instruments
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: March 23, 2012
Revised Manuscript: May 20, 2012
Manuscript Accepted: May 21, 2012
Published: July 12, 2012

Qianghua Chen, Huifu Luo, Sumei Wang, and Feng Wang, "Measurement of air refractive index based on surface plasmon resonance and phase detection," Opt. Lett. 37, 2916-2918 (2012)

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