作者:刘超，付海昊，吕靖薇，王建鑫

Authors:LIU Chao,FU Hai-hao,LU Jing-wei,WANG Jian-xin
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摘要:摘要:随着光纤传感技术的不断发展，基于表面等离子体共振(SPR)的光子晶体光纤(PCF)传感器成为了当前传感领域的热点。目前激发SPR的模式主要以LP_0,1为主，而利用轨道角动量(OAM)模式激发SPR的PCF传感器的研究很少。采用有限元仿真的方法提出了一种由OAM的基模(HE_1,1模)激发SPR的PCF传感器，并对其相位匹配、波长灵敏度、FOM等性能进行了研究。数值结果表明：SPR传感器可检测折射率范围在1.29~1.37内的分析物，最大波长灵敏度为10 000 nm/RIU，且FOM高达200.89 RIU^-1；另外，采用金介质填充的方法替代传统镀膜工艺降低了传感器的制备难度。该PCF-SPR传感器在安全监测、石油测井等方面有着巨大应用。
Abstract:Abstract:With the continuous development of optical fiber sensing technology， photonic crystal fiber (PCF) sensors based on surface plasmon resonance (SPR) have become a hot spot in the current sensing field. At present， the modes for exciting SPR are mainly LP_0,1， and there are few studies on PCF sensors using orbital angular momentum (OAM) mode to excite SPR. A PCF sensor with SPR excited by the fundamental mode (HE_1,1 mode) of OAM is proposed by finite element simulation， and its phase matching， wavelength sensitivity， FOM and other properties are studied. Numerical results indicate that the SPR sensor can detect analytes with a refractive index in the range of 1.29~1.37， the maximum wavelength sensitivity is 10,000 nm/RIU， and the FOM is as high as 200.89 RIU^-1 . In addition， using the gold dielectric filling method to replace the traditional coating process reduces the fabrication difficulty of the sensor. The PCF-SPR sensor has great applications in safety monitoring， oil logging， and so on.
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