Basumallick, Nandini and Biswas, Palas and Carter, Richard Mark and Maier, Robert R J and Bandyopadhyay, Sankhyabrata and Dasgupta, Kamal and Bandyopadhyay, Somnath (2016) Design of Palladium-Coated Long-Period Fiber Grating for Hydrogen Sensing. Journal of Lightwave Technology, 34 (21). pp. 4912-4919. ISSN 0733-8724

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We present a detailed numerical analysis that describes the influence of palladium (Pd) layer thickness on the spectral characteristics of long-period fiber gratings (LPFGs) and their response to the uptake of hydrogen. The investigation is carried out with a view of determining an optimal layer thickness to design high-sensitivity LPFG-based hydrogen sensors. Coupled differential equations for a four-layerwaveguide structure have been solved using a matrix method considering a layer of Pd with finite thickness on the cladding. Response of higher order cladding modes of the Pd-coated LPFG at turn-around-point and also at mode transition could be computed. It has been shown that if properly designed, the resonant wavelength of a desired mode may shift by about 20 nm for 1% uptake of hydrogen. There is good match between simulations and experiments for LPFGs with coupling to higher order cladding modes

Item Type: Article
Subjects: Processing Science
Divisions: Fiber Optics and Photonics
Depositing User: Bidhan Chaudhuri
Date Deposited: 25 Jan 2017 12:40
Last Modified: 25 Jan 2017 12:40

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