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Design and Simulation of a Highly Sensitive SPR Optical Fiber Sensor

机译：高灵敏度SPR光纤传感器的设计与仿真

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An idea of the surface plasmon resonance (SPR) has been utilized for the design of highly sensitive sensors based on the wagon-wheel fiber technology. Such sensors are sensitive to changes in the refractive index of sample analyte. In this study, a three-strut wagon-wheel structure, coated with the gold layer of nano-sized thickness, has been proposed as the SPR sensor. Finite element method is employed to simulate and tune the proposed SPR’s design, which leads to a highly sensitive and multichannel plasmonic sensor with the ability for a dual reading on a single analyte or simultaneous identification of two analytes. In this design, suitable thickness values for the gold layer and core struts are determined. Sensitivities of the detector due to the first resonance peak, second resonance peak, and the difference in resonance peaks are calculated to be 1120 nm/RIU, 1540 nm/RIU, and 420 nm/RIU, respectively, when analytes are placed in all three channels of the fiber. Sensitivity of the detector with respect to the second resonant peak for analyte in Channels 2 and 3 is also found to be 1252 nm/RIU when Channel 1 is filled with the reference. The sensitivity and resolution of the sensor increase as the refractive index of the analyte increases by almost a linear proportion. If the sensor is utilized to detect the difference in two peaks, it would substantially reduce the noise, and the best result is expected. The thicknesses of the struts and the gold layer are proper parameters to be tuned in designing the detector.
机译：表面等离子体共振（SPR）的思想已被用于基于车轮纤维技术的高灵敏度传感器的设计。这种传感器对样品分析物的折射率的变化敏感。在这项研究中，已经提出了一种三支柱马车车轮结构，该结构涂有纳米级厚度的金层，作为SPR传感器。采用有限元方法对拟议的SPR设计进行仿真和调整，这导致了一种高灵敏度，多通道等离激元传感器，能够对单个分析物进行双重读取或同时识别两种分析物。在该设计中，确定了金层和芯撑的合适厚度值。当将分析物置于所有三个样品中时，由于第一共振峰，第二共振峰和共振峰之差引起的检测器灵敏度分别计算为1120 nm / RIU，1540 nm / RIU和420 nm / RIU。光纤通道。当在通道1中充满参比物时，还发现检测器相对于通道2和3中分析物的第二个共振峰的灵敏度为1252 nm / RIU。传感器的灵敏度和分辨率随着分析物的折射率几乎成线性比例的增加而增加。如果利用传感器检测两个峰之间的差异，则它将大大降低噪声，并有望获得最佳结果。支柱和金层的厚度是在设计检测器时需要调整的适当参数。

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