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    Characterization of optical fiber long period grating refractometer with nanocoating

    Year: 2011

    Journal: Sensors and Actuators B, 2011, 153 (2), 335-339, 20131009

    Authors: E. Simões, I. Abe, J. Oliveira, O. Frazão, P. Caldas, J.L. Pinto

    Organizations: I3N/FSCOSD, University of Aveiro, 3810-193 Aveiro, Portugal; Department of Chemistry/CESAM, University of Aveiro, 3810-193 Aveiro, Portugal; INESC Porto, 4169-007 Porto, Portugal; School of Technology and Management, Viana do Castelo Polytechnic Institute, 4900-348 Viana do Castelo, Portugal

    In this work is studied the response of optical fiber long period grating (LPG) to changes of the refractive index of the external media relatively to variations of wavelength and in transmission. The response of the LPG to refractive index greater and lesser than to cladding is investigated. A nanolayer was deposited onto the fiber to increase the sensitivity of the LPG to refractive index of the external media higher than cladding. The film modifies the rates of effective modes of cladding, thus improving the response of the changes in the refractive index of the external media higher than that in the refractive index of the cladding (ncl ≈ 1.457). The Langmuir–Blodgett technique was used for the deposition of the nanolayer.