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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 4 — Feb. 16, 2009
  • pp: 2731–2738

Highly versatile fiber-based optical Fabry-Pérot gas sensor

Jing Liu, Yuze Sun, and Xudong Fan  »View Author Affiliations


Optics Express, Vol. 17, Issue 4, pp. 2731-2738 (2009)
http://dx.doi.org/10.1364/OE.17.002731


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Abstract

We develop a versatile, compact, and sensitive fiber-based optical Fabry-Pérot (FP) gas sensor. The sensor probe is composed of a silver layer and a vapor-sensitive polymer layer that are sequentially deposited on the cleaved fiber endface, thus forming an FP cavity. The interference spectrum resulting from the reflected light at the silver-polymer and polymer-air interfaces changes when the polymer is exposed to gas analytes. This structure enables using any polymer regardless of the polymer refractive index (RI), which significantly enhances the sensor versatility. In experiments, we use polyethylene glycol (PEG) 400 (RI=1.465-1.469) and Norland Optical Adhesive (NOA) 81 (RI=1.53-1.56) as the gas sensing polymer and show drastically different sensor response to hexanol, methanol, and acetone. The estimated sensitivity for methanol vapor is 3.5 pm/ppm and 0.1 pm/ppm for PEG 400 and NOA 81, respectively, with a detection limit on the order of 1–10 ppm. Gas sensing for the analytes delivered in both continuous flow mode and pulsed mode is demonstrated.

© 2009 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(070.4790) Fourier optics and signal processing : Spectrum analysis
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(230.3990) Optical devices : Micro-optical devices
(310.6860) Thin films : Thin films, optical properties

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: January 21, 2009
Revised Manuscript: February 4, 2009
Manuscript Accepted: February 4, 2009
Published: February 10, 2009

Citation
Jing Liu, Yuze Sun, and Xudong Fan, "Highly versatile fiber-based optical Fabry-Pérot gas sensor," Opt. Express 17, 2731-2738 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-4-2731


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