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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 22 — Aug. 1, 2011
  • pp: 4257–4261

Interrogation technique for TFBG-SPR refractometers based on differential orthogonal light states

Valérie Voisin, Christophe Caucheteur, Patrice Mégret, and Jacques Albert  »View Author Affiliations

Applied Optics, Vol. 50, Issue 22, pp. 4257-4261 (2011)

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The generation of near-IR surface plasmon resonance in gold-coated tilted fiber Bragg gratings is strongly dependent on both the polarization state of the transmission light and the property of confining materials (including the coating materials and surrounding media). These dependencies can be advantageously used to demodulate the amplitude spectrum and retrieve the surrounding refractive index. In this paper, we present an automated demodulation technique that measures the surrounding refractive index by comparing the differential amplitude of resonance peaks near the plasmon attenuation for two orthogonal amplitude spectra recorded in the same operating conditions. A mean sensitivity of more than 500 nm per refractive index unit is reported. This new refractive index measurement method is shown to be accurate to 5 × 10 5 over a full range of 0.01 in water solutions.

© 2011 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: May 19, 2011
Manuscript Accepted: June 16, 2011
Published: July 21, 2011

Virtual Issues
Vol. 6, Iss. 9 Virtual Journal for Biomedical Optics

Valérie Voisin, Christophe Caucheteur, Patrice Mégret, and Jacques Albert, "Interrogation technique for TFBG-SPR refractometers based on differential orthogonal light states," Appl. Opt. 50, 4257-4261 (2011)

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