Design of Palladium-Coated Long-Period Fiber Grating for Hydrogen Sensing

被引:21
作者
Basumallick, Nandini [1 ]
Biswas, Palas [1 ]
Carter, Richard Mark [2 ]
Maier, Robert R. J. [2 ]
Bandyopadhyay, Sankhyabrata [1 ]
Dasgupta, Kamal [1 ]
Bandyopadhyay, Somnath [1 ]
机构
[1] CSIR Cent Glass & Ceram Res Inst, Fiber Opt & Photon Div, Kolkata 700032, India
[2] Heriot Watt Univ, Inst Photon & Quantum Sci, Edinburgh EH14 4AS, Midlothian, Scotland
关键词
Hydrogen detection; long period fiber gratings; mode transition; palladium coatings; turn-around-point grating; REFRACTIVE-INDEX; EVANESCENT FIELD; SENSOR; PD; OPTICS; FILM;
D O I
10.1109/JLT.2016.2604481
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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
引用
收藏
页码:4912 / 4919
页数:8
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