Haque Emranul, Anwar Hossain Md, Namihira Yoshinori, Ahmed Feroz
Appl Opt. 2019 Feb 20;58(6):1547-1554. doi: 10.1364/AO.58.001547.
A microchannel incorporated photonic crystal fiber (PCF)-based surface plasmon resonance (SPR) sensor for detection of low refractive index (RI) at near-infrared wavelength is presented in this paper. To attain a simple and practically feasible mechanism, plasmonic material gold (Au) and sensing medium are placed outside the fiber. A thin layer of TiO is employed as an adhesive layer to strongly attach the Au with the silica glass. In the sensing range of 1.22 to 1.37, maximum sensitivities of 51,000 nm/RIU (RI unit) and 1872 RIU are obtained with resolutions of 1.96×10 and 9.09×10 RIUs using wavelength and amplitude interrogation methods, respectively. To the best of the authors' knowledge, the obtained maximum wavelength sensitivity and resolution are the highest among reported PCF-based SPR sensors to date. The sensor also exhibits a maximum figure of merit of 566. Therefore, the proposed sensor would be an excellent candidate for a wide range of RI detection with higher accuracy for applications such as pharmaceutical inspection and leakage monitoring, bio-sensing, and other low RI analytes.
本文提出了一种基于微通道光子晶体光纤（PCF）的表面等离子体共振（SPR）传感器，用于在近红外波长下检测低折射率（RI）。为了实现一种简单且切实可行的机制，将等离子体材料金（Au）和传感介质置于光纤外部。采用一层薄的TiO作为粘合剂层，将Au与石英玻璃牢固地连接起来。在1.22至1.37的传感范围内，分别使用波长和幅度询问方法，获得了51,000 nm/RIU（RI单位）和1872 RIU的最大灵敏度，分辨率分别为1.96×10和9.09×10 RIU。据作者所知，所获得的最大波长灵敏度和分辨率是迄今为止报道的基于PCF的SPR传感器中最高的。该传感器还展现出566的最大品质因数。因此，所提出的传感器将是用于药物检测和泄漏监测、生物传感以及其他低RI分析物等应用中高精度广泛RI检测的极佳候选者。
