Liu Qiang, Sun Jiudi, Sun Yudan, Liu Wei, Lv Jingwei, Liu Chao, Li Xianli, Ren Zonghuan, Wang Famei, Lu Wenshu, Jiang Yu, Sun Tao, Chu Paul K
Appl Opt. 2020 Aug 1;59(22):6484-6489. doi: 10.1364/AO.395605.
A highly sensitive surface plasmon resonance (SPR) sensor comprising an eccentric core photonic quasi-crystal fiber (PQF) coated with indium tin oxide is designed and numerically analyzed. The novel, to the best of our knowledge, structure with an eccentric core layout and local coating not only strengthens coupling between the core mode and surface plasmon polariton mode but also provides higher refractive index sensitivity in the near-infrared region. Analysis based on the finite element method to assess the performance of the sensor and optimize the structural parameters reveals that the maximum wavelength sensitivity and resolution are 96667 nm/RIU and 1.034×10 in the sensing range between 1.380 and 1.413, respectively. Meanwhile, the average sensitivity is enhanced to 25458 nm/RIU. The sensor is expected to have broad applications in environmental monitoring, biochemical sensing, food safety testing, and related applications due to the ultrahigh sensitivity and resolution.
设计并数值分析了一种高灵敏度表面等离子体共振（SPR）传感器，该传感器由涂有氧化铟锡的偏心芯光子准晶体光纤（PQF）组成。据我们所知，这种具有偏心芯布局和局部涂层的新型结构不仅增强了芯模与表面等离子体激元模之间的耦合，而且在近红外区域提供了更高的折射率灵敏度。基于有限元方法的分析用于评估传感器的性能并优化结构参数，结果表明，在1.380至1.413的传感范围内，最大波长灵敏度和分辨率分别为96667 nm/RIU和1.034×10，同时平均灵敏度提高到25458 nm/RIU。由于具有超高的灵敏度和分辨率，该传感器有望在环境监测、生化传感、食品安全检测及相关应用中得到广泛应用。
