We have introduced an infrared refractive-index-based sensor operating at the infrared frequency region. In designing the sensor, we have used a metamaterial structure with unit cells composed of two metallic layers, the first involving two metallic bars and slabs, and the second containing a uniform metallic sheet. With a mechanism analogous to the theoretical blackbody absorber, the structure behaves as a resonant perfect absorber. Its resonance frequency strongly depends on the refractive index of the surrounding medium, a characteristic that is used for designing the sensor. In general, the sensitivity of the sensor is calculated to be 2720 nm/RIU, equivalent to 940 THz/RIU, and the figure of merit is calculated to be 81.93. We have also studied potential application of the sensor for glucose solution concentration detection, which is important in medical and food industries.

中文翻译：

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红外超材料折射率传感器

我们推出了一种在红外频率范围内运行的基于红外折射率的传感器。在设计传感器时，我们使用了超材料结构，其单位单元由两个金属层组成，第一层包含两个金属条和平板，第二层包含均匀的金属板。通过类似于理论黑体吸收器的机制，该结构可充当共振完美吸收器。它的共振频率在很大程度上取决于周围介质的折射率，这是用于设计传感器的特性。通常，传感器的灵敏度经计算为2720 nm / RIU，相当于940 THz / RIU，品质因数经计算为81.93。我们还研究了传感器在葡萄糖溶液浓度检测中的潜在应用，