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Proceedings Paper

Chiral fiber sensors
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Paper Abstract

We have fabricated a variety of chiral fiber sensors by twisting one or more standard or custom optical fibers with noncircular or nonconcentric core as they pass though a miniature oven. The resulting structures are as stable as the glass material and can be produced with helical pitch ranging from microns to hundreds of microns. The polarization selectivity of the chiral gratings is determined by the geometry of the fiber cross section. Single helix structures are polarization insensitive, while double helix gratings interact only with a single optical polarization component. Both single and double helix gratings may function as a fiber long period grating, coupling core and cladding modes or as a diffraction grating scattering light from the fiber core out of the fiber. The resulting dips in the transmission spectrum are sensitive to fiber elongation, twist and temperature, and (in the case of the long period gratings) to the refractive index of the surrounding medium. The suitability of chiral gratings for sensing temperature, elongation, twist and liquid levels will be discussed. Gratings made of radiation sensitive glass can be used to measure the cumulative radiation dose, while gratings made of radiation-hardened glass are suitable for stable sensing of the environment in nuclear power plants. Excellent temperature stability up to 900°C is found in pure silica chiral diffraction grating sensors.

Paper Details

Date Published: 23 April 2010
PDF: 6 pages
Proc. SPIE 7677, Fiber Optic Sensors and Applications VII, 76770U (23 April 2010); doi: 10.1117/12.852663
Show Author Affiliations
Victor I. Kopp, Chiral Photonics, Inc. (United States)
Victor M. Churikov, Chiral Photonics, Inc. (United States)
Jonathan Singer, Chiral Photonics, Inc. (United States)
Daniel Neugroschl, Chiral Photonics, Inc. (United States)
Azriel Z. Genack, Chiral Photonics, Inc. (United States)
Queens College, CUNY (United States)

Published in SPIE Proceedings Vol. 7677:
Fiber Optic Sensors and Applications VII
Alexis Mendez; Henry H. Du; Anbo Wang; Eric Udd; Stephen J. Mihailov, Editor(s)

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