液体填充光子晶体光纤长周期光栅双谐振温度传感器的设计与优化

本文在正六边形光子晶体光纤长周期光栅包层空气孔中选择性填充液体材料,设计并优化一种高灵敏度长周期光栅双谐振温度传感器。基于模式耦合理论建立光纤光栅传感模型,发现在包层空气孔填充特定折射率液体材料后,同一光栅周期下,模型分别在短波长、长波长处出现透射谐振峰,然后利用全矢量有限元法在完美匹配层边界条件下对模型的温度特性进行了数值分析。结果表明:当包层空气孔中填充磁流体时,随着温度的升高,左峰(短波长处)中心波长蓝移,右峰(长波长处)中心波长红移,且左、右峰间隔随温度变化曲线近似线性,其温度灵敏度为11.40 nm／℃;当第一层空气孔中填充折射率温度系数更高的乙醇,其他空气孔中填充磁流体时,左、右峰间隔的温度灵敏度为2.99 nm／℃。

Abstract

The temperature sensor of the long period grating is designed and optimized by selectively filling the cladding air holes of hexagonal long period photonic crystal fiber gratings with liquid materials. Based on the mode coupling theory, the sensing model is established. It is found that the transmission resonant peaks appear in the short and long wavelength respectively with the same grating period after the cladding air holes filled with liquid material which has specific refractive index. Then, the temperature characteristics of the model are numerically analyzed by utilizing the finite element method under the perfectly matched layer boundary condition. The results show that the center wavelength of the left peak (the short wavelength) has a blue-shift when the air holes are filled with magnetic fluid, while the center wavelength of the right peak (the long wavelength) has a red-shift. The change of interval between left and right peak is approximately linear and the temperature sensitivity is 11.40 nm／℃. When the first layer of air holes are filled with ethanol which has a higher temperature coefficient while other air holes are filled with magnetic fluid, the temperature sensitivity of the interval between left and right peak is 2.99 nm／℃.

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王晴, 丁毅, 谭策, 李宏伟, 王猛, 刘海. 液体填充光子晶体光纤长周期光栅双谐振温度传感器的设计与优化[J]. 量子光学学报, 2018, 24(1): 84. WANG Qing, DING Yi, TAN Ce, LI Hong-wei, WANG Meng, LIU Hai. Dual Resonance Temperature Sensor of a Long-Period Grating Written in a Liquid-Filled Photonic Crystal Fiber[J]. Acta Sinica Quantum Optica, 2018, 24(1): 84.

液体填充光子晶体光纤长周期光栅双谐振温度传感器的设计与优化

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