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Please use this identifier to cite or link to this item: http://dspace.lib.cranfield.ac.uk/handle/1826/5064

Document Type: Article
Title: Fiber optic long period grating sensors with a nanoassembled mesoporous film of SiO2 nanoparticles
Authors: Korposh, Sergiy
James, Stephen W.
Lee, Seung-Woo
Topliss, Stephen M.
Cheung, Sammy C.
Batty, William J.
Tatam, Ralph P.
Issue Date: 2010
Citation: Sergiy Korposh, Stephen W. James, Seung-Woo Lee, Stephen Topliss, Sammy C. Cheung, William J. Batty, and Ralph P. Tatam. Fiber optic long period grating sensors with a nanoassembled mesoporous film of SiO2 nanoparticles. Optics Express, Vol. 18, Issue 12, June 2010, pp13227-13228
Abstract: A novel approach to chemical application of long period grating (LPG) optical fibers was demonstrated, which were modified with a film nanoassembled by the alternate deposition of SiO2 nanoparticles (SiO2 NPs) and poly(diallyldimethyl ammonium chloride) (PDDA). Nanopores of the sensor film could be used for sensitive adsorption of chemical species in water, which induced the changes in the refractive index (RI) of the light propagating in the cladding mode of the optical fiber, with a concomitant effect on the transmission spectrum in the LPG region. The prepared fiber sensor was highly sensitive to the change in the RI of the surrounding medium and the response time was very fast within 10 s. In addition, chemical infusion into the film was tested using a porphyrin compound, tetrakis-(4-sulfophenyl)porphine (TSPP), which could be saturated within a few min. The lowest detectable concentration of the TSPP analyte was 10 mu M. The TSPP infusion led to the development of well-pronounced dual resonance bands, indicating a large increase in the optical thickness of the film. The RI of the film was dramatically increased from 1.200 to ca. 1.540.
URI: http://dx.doi.org/10.1364/OE.18.013227
http://dspace.lib.cranfield.ac.uk/handle/1826/5064
Appears in Collections:Staff publications - School of Engineering

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