Euser, T. G., Chen, J. S. Y., Scharrer, M., Russell, Philip St. J., Farrer, Nicola J. and Sadler, P. J.. (2008) Quantitative broadband chemical sensing in air-suspended solid-core fibers. Journal of Applied Physics, Vol.103 (No.10). p. 103108. ISSN 0021-8979

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Abstract

We demonstrate a quantitative broadband fiber sensor based on evanescent-field sensing in the cladding holes of an air-suspended solid-core photonic crystal fiber. We discuss the fabrication process, together with the structural and optical characterization of a range of different fibers. Measured mode profiles are in good agreement with finite element method calculations made without free parameters. The fraction of the light in the hollow cladding can be tuned via the core diameter of the fiber. Dispersion measurements are in excellent agreement with theory and demonstrate tuning of the zero dispersion wavelength via the core diameter. Optimum design parameters for absorption sensors are discussed using a general parameter diagram. From our analysis, we estimate that a sensitivity increase of three orders of magnitude is feasible compared to standard cuvette measurements. Our study applies to both liquid and gas fiber sensors. We demonstrate the applicability of our results to liquid chemical sensing by measuring the broad absorption peak of an aqueous NiCl2 solution. We find excellent agreement with the reference spectrum measured in a standard cuvette, even though the sample volume has decreased by three orders of magnitude. Our results demonstrate that air-suspended solid-core photonic crystal fibers can be used in quantitative broadband chemical-sensing measurements. (C) 2008 American Institute of Physics.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science > Chemistry
Library of Congress Subject Headings (LCSH):	Fiber optics, Chemical detectors, Finite element method, Optical fibers, Photonic crystals
Journal or Publication Title:	Journal of Applied Physics
Publisher:	American Institute of Physics
ISSN:	0021-8979
Official Date:	15 May 2008
Volume:	Vol.103
Number:	No.10
Number of Pages:	7
Page Range:	p. 103108
Identification Number:	10.1063/1.2924408
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Körber-Stiftung
URI:	http://wrap.warwick.ac.uk/id/eprint/29908

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