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首页> 外文期刊>IEEE sensors journal >Design of Extremely Sensitive Refractive Index Sensors in Infrared for Blood Glucose Detection
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Design of Extremely Sensitive Refractive Index Sensors in Infrared for Blood Glucose Detection

机译：血糖检测红外极敏感折射率传感器的设计

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摘要

Simple and easy to fabricate sensors with high sensitivity, high quality-factor (chi), large figure of merit (FOM), and narrow bandwidth are highly desirable for immediate point of care testing. In this article, we introduce a one-dimensional periodic array of barium flint glass on active plasmonic material, a thin gold film on silicon nitride (Si-3 N-4) substrate. Reflection spectrum of the proposed structure exhibits a clear rejection of certain wavelength on normal incidence due to the coupling between incident plane wave and plasmonic wave. The effect of ambient refractive index or glucose concentration has been studied to measure the plasmonic sensitivity of the designed structure in blood glucose detection. After optimizing geometric parameters, the designed sensor achieved sensitivity and quality factor as high as similar to 2600 nm RIU-1 (refractive index unit) and similar to 1500 respectively. The calculated sensitivity, quality factor and FOM are much higher than the reported structures with a similar geometry in IR. Owing only one rejection band with narrow bandwidth, the designed structure can also be realized for optical filtering applications. Wide spectral tunability in the IR, close to 100% peak absorbance and narrow bandwidth make the designed structures as an ideal candidate for surface-enhanced infrared absorption (SEIRA) spectroscopy.
机译：简单易于制造具有高灵敏度，高质量因子（CHI），大图（FOM）的传感器，并且窄带宽对于即时护理测试非常适合。在本文中，我们在有源等离子体材料上介绍了一维的钡燧石玻璃阵列，氮化硅（Si-3 N-4）衬底上的薄金膜。由于入射平面波和等离子体波之间的耦合，所提出的结构的反射光谱对正常入射的一定波长透明抑制。已经研究了环境折射率或葡萄糖浓度的影响，以测量设计结构在血糖检测中的等离子体敏感性。优化几何参数后，设计的传感器实现了高度与2600nm Riu-1（折射率单元）相似的灵敏度和质量因数，并且分别类似于1500。计算的灵敏度，质量因子和FOM远高于IR中具有类似几何形状的报告结构。由于带宽窄的一个抑制带，也可以实现设计的结构，用于光学过滤应用。 IR中的宽光谱可调性，接近100％的峰值吸光度和窄带宽使设计的结构作为表面增强的红外吸收（Seira）光谱的理想候选者。

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