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Highly sensitive fiber Bragg grating refractive index sensors

Liang, Wei and Huang, Yanyi and Xu, Yong and Lee, Reginald K. and Yariv, Amnon (2005) Highly sensitive fiber Bragg grating refractive index sensors. Applied Physics Letters, 86 (15). Art. No. 151122. ISSN 0003-6951. doi:10.1063/1.1904716.

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We combine fiber Bragg grating (FBG) technology with a wet chemical etch-erosion procedure and demonstrate two types of refractive index sensors using single-mode optical fibers. The first index sensor device is an etch-eroded single FBG with a radius of 3 μm, which is used to measure the indices of four different liquids. The second index sensor device is an etch-eroded fiber Fabry-Perot interferometer (FFPI) with a radius of ~1.5 μm and is used to measure the refractive indices of isopropyl alcohol solutions of different concentrations. Due to its narrower resonance spectral feature, the FFPI sensor has a higher sensitivity than the FBG sensor and can detect an index variation of 1.4 X 10(-5). Since we can measure the reflection signal, these two types of sensors can be fabricated at the end of a fiber and used as point sensors.

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Additional Information:© 2005 American Institute of Physics. Received 31 January 2005; accepted 16 March 2005; published online 8 April 2005. The authors thank Will Green, John M. Choi and Joyce Poon for helpful discussions. This work is supported by the National Science Foundation (DMR-0120967) and the Defense Advanced Research Projects Agency (N00014-04-1-0094).
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-04-1-0094
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Subject Keywords:organic compounds; Bragg gratings; optical fibres; refractive index; fibre optic sensors; reflectivity; Fabry-Perot interferometers
Issue or Number:15
Record Number:CaltechAUTHORS:LIAapl05
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1711
Deposited By: Tony Diaz
Deposited On:13 Feb 2006
Last Modified:08 Nov 2021 19:41

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