用于宽范围低折射率探测的表面等离子共振传感器

Emranul Haque, M. Hossain, T. Pham, Y. Namihira, N. H. Hai, Feroz Ahmed
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引用次数: 2

摘要

本文提出了一种基于d形光子晶体光纤(PCF)的等离子体传感器,用于在近红外到中红外波段检测更宽范围的低折射率。采用基于y偏振横电(TE)模式的有限元方法,对该传感器的波长灵敏度、幅度灵敏度和分辨率进行了数值研究。在光纤外放置等离子体材料金(Au)和传感层,以实现实际可行的探测机制。采用一薄层二氧化钛(TiO2)作为粘接层,以便将等离子体材料与硅玻璃粘接在一起。在1.00 ~ 1.37的感应范围内,以5\ × 10^{-6}$和1.43\ × 10^{-5}$ RIU的分辨率,分别获得了20000nm /RIU和811折射率单位(RIU)−1的最大灵敏度。因此,它将是环境监测、药品检验、有机化学传感和其他分析物检测的合适候选者。
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Surface Plasmonic Resonance Sensor for Wider Range of Low Refractive Index Detection
A D-shaped photonic crystal fiber (PCF) based plasmonic sensor for detection of a wider range of low refractive indexes operating at near to mid-infrared wavelengths is presented in this paper. Using finite element method (FEM) on the basis of y-polarized transverse electric (TE) mode TEy, wavelength sensitivity, amplitude sensitivity and resolution of the proposed sensor have been investigated numerically. Plasmonic material Gold (Au) and sensing layer are placed outside the fiber for attaining practically feasible detection mechanism. A thin layer of titanium dioxide (TiO2) is employed as an adhesive layer in order to attach the plasmonic material with silica glass. In the sensing range of 1.00 to 1.37, maximum sensitivities of 20000 nm/RIU and 811 refractive index unit (RIU)−1 are obtained with resolutions of $5\times 10^{-6}$ and $1.43\times 10^{-5}$ RIU using wavelength and amplitude interrogation method, respectively. Therefore, it would be a suitable candidate for environmental monitoring, pharmaceutical inspection, organic chemical sensing, and other analytes detection.
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