NDLI: Coated long-period fiber gratings as high-sensitivity optochemical sensors

Content Provider	IEEE Xplore Digital Library
Author	Cusano, A. Iadicicco, A. Pilla, P. Contessa, L. Campopiano, S. Cutolo, A. Giordano, M. Guerra, G.
Copyright Year	1983
Abstract	In this paper, the numerical and the experimental analyses of coated long-period fiber gratings (LPFGs) as a high-sensitivity optochemical sensor are presented. The proposed structure relies on LPFGs coated with nanoscale high refractive index chemical-sensitive overlays. The deposition of overlays with refractive index higher than the cladding one leads to a modification of the cladding-mode distribution. If the overlay features are properly chosen, a strong field enhancement within the overlay occurs, leading to an excellent sensitivity of the cladding-mode distribution to the coating properties. The effects of overlay thickness and cladding-mode order on sensor performances have been numerically and experimentally investigated. In order to provide a high-sensitivity and species-specific optochemical sensor, this mechanism has been proved with nanoscale overlays of syndiotactic polystyrene (sPS) in the nanoporous crystalline /spl delta/ form. The sensitive material has been chosen in light of its selectivity and high sorption properties towards chlorinated and aromatic compounds. Sensor probes were prepared by using dip-coating technique and an adequate procedure to obtain the /spl delta/-form sPS. Experimental demonstration of the sensor capability to perform subparts-per-million detection of chloroform in water at room temperature is also reported.
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	1776
Ending Page	1786
Page Count	11
File Size	363865
File Format	PDF
ISSN	07338724
Volume Number	24
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical fiber sensors Fiber gratings Chemical sensors Refractive index Nanoporous materials Temperature sensors Coatings Crystallization Crystalline materials Probes syndiotactic polystyrene (sPS) long-period fiber gratings (LPFGs) refractive-index sensors
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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