D-Shaped Tellurite Photonic Crystal Fiber Hydrogen and Methane Sensor Based on Four-Wave Mixing With SPR Effect  

作　　者：Hai LIU Bo WU Cong CHEN Benlei ZHAO Xu ZHANG Hancheng ZHANG 

机构地区：[1]School of Information and Control Engineering,China University of Mining and Technology,Xuzhou 221116,China [2]Engineering Research Center of Intelligent Control for Underground Space(Ministry of Education),China University of Mining and Technology,Xuzhou 221116,China

出　　处：《Photonic Sensors》2023年第1期25-39,共15页光子传感器（英文版）

基　　金：funded by the National Natural Science Foundation of China(Grant No.51874301);Primary Research&Development Plan of Xuzhou City(Grant No.KC20162).

摘　　要：A new D-shaped tellurite photonic crystal fiber sensor based on the four-wave mixing(FWM)effect with the surface plasmon resonance(SPR)effect is designed and optimized.The substrate of the D-shaped photonic crystal fiber(D-PCF)is tellurite glass,and the polished surface is plated with the gold film and hydrogen gas-sensitive film.An air hole of the inner cladding,which is plated with the gold film and methane gas-sensitive film,is selected as the second sensing channel to simultaneously measure the concentration of hydrogen and methane.Based on the four-wave mixing,the wavelength shifts of the Stokes and anti-Stokes spectra resulting from the variation of the gas concentration can be used to accurately detect the concentrations of methane and hydrogen.Meanwhile,it is found that the SPR effect can increase the wavelength shifts,which means the sensitivity of methane and hydrogen augment.After parameter optimization,the maximum sensitivities of methane and hydrogen are 4.03 nm/%and-14.19 nm/%,respectively.Both the linearities are up to 99.9%.The resolution of methane is 1.25×10^(-2)%and hydrogen is 7.14×10^(-3)%.Moreover,the fiber length of this sensor is only 20mm,which is conducive to the construction of a compact or ultra-compact embedded FWM fiber sensor.

关 键 词：Four-wave mixing surface plasmon resonance D-shaped photonic crystal fiber gas sensing 

分 类 号：TN253[电子电信—物理电子学]