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Surface plasmon resonance refractive index sensor based on photonic crystal fiber covering nano-ring gold film

机译：基于光子晶体光纤覆盖纳米环金膜的表面等离子体共振折射率传感器

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摘要

We propose a tunable wide-range surface plasmon induced refractive index optical sensor based on photonic crystal fiber (PCF) covered nano-ring gold film. The free electrons on the gold surface will resonate with photons to excite the attenuation and transmission of surface plasmon waves on the metal surface, when the vibrational frequencies of photons and electrons are the same. The refractive index analytes are very sensitive to SPR, which will be applied to PCF refractive index sensors. The finite element method (FEM) is used to analyze and simulate the sensing performance of the refractive index sensor. A kind of refractive index analyte is infiltrated into the outermost air holes of cladding. However, the resonance coupling between the fundamental mode and surface plasmon polariton (SPP) mode happens when the phase matching condition is matched. The resonance wavelength for 1st and 3rd peaks dependence on the refractive index analyte follows polynomial fitting law, and their fitness are 0.99605 and 0.99623, respectively. When the range of refractive index is from 1.33 to 1.39 and 1.40 to 1.43, the dependence of the resonant wavelength on the refractive index of the analyte follows a linear law and exhibits a relatively high sensitivity.
机译：我们提出了一种基于光子晶体光纤（PCF）覆盖的纳米环金膜的可调谐宽范围表面等离子体激元诱导的折射率光学传感器。当光子和电子的振动频率相同时，金表面上的自由电子将与光子发生共振，从而激发金属表面上的等离激元波的衰减和透射。折射率分析物对SPR非常敏感，它将被应用于PCF折射率传感器。有限元方法（FEM）用于分析和模拟折射率传感器的传感性能。一种折射率分析物渗透到包层的最外面的气孔中。但是，当相位匹配条件匹配时，基本模式和表面等离子体激元（SPP）模式之间会发生共振耦合。第一和第三峰的共振波长取决于折射率分析物，服从多项式拟合定律，其适应度分别为0.99605和0.99623。当折射率的范围为1.33至1.39和1.40至1.43时，共振波长对被分析物的折射率的依赖性遵循线性定律并且表现出相对较高的灵敏度。

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