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

被引：22

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

来源：

JOURNAL OF LIGHTWAVE TECHNOLOGY | 2016年 / 34卷 / 21期

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

页码：4912 / 4919

页数：8

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