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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 12 — Jun. 7, 2010
  • pp: 13227–13238

Fiber optic long period grating sensors with a nanoassembled mesoporous film of SiO2 nanoparticles

Sergiy Korposh, Stephen W. James, Seung-Woo Lee, Stephen Topliss, Sammy C. Cheung, William J. Batty, and Ralph P. Tatam  »View Author Affiliations

Optics Express, Vol. 18, Issue 12, pp. 13227-13238 (2010)

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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 μM. 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.

© 2010 OSA

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(310.1860) Thin films : Deposition and fabrication

ToC Category:

Original Manuscript: March 31, 2010
Revised Manuscript: April 30, 2010
Manuscript Accepted: May 1, 2010
Published: June 4, 2010

Virtual Issues
Vol. 5, Iss. 10 Virtual Journal for Biomedical Optics

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," Opt. Express 18, 13227-13238 (2010)

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