用于双波段无滤波器气体传感的基于磁极化子的热发射器
Magnetic polariton-based thermal emitter for dual-band filterless gas sensing
摘要：
红外气体传感器的小型化在很大程度上受到昂贵和庞大的激光源以及使用光学滤波器的阻碍。在这项工作中，我们提出了一个双波段，定向热发射器的基础上紧凑的W-Si-Cu超颖表面来解决这个问题。该超颖表面发射器被设计为支持两种非色散磁极化子模式，其表现出不同的方向性热发射轮廓，从而实现双波段检测而不需要光学滤波器。具体而言，我们评估这种双波段无滤波器检测的可行性，通过适应超表面发射器CO2传感。该传感系统模型对CO_2的选择性相对灵敏度比黑体发射体提高了3.2倍，发射体的温度相对灵敏度约为1.32%/K。
英文摘要：
The miniaturization of infrared gas sensors is largely hindered by expensive and bulky laser sources as well as the use of optical filters. In this work, we propose a dual-band, directional thermal emitter based on compact W-Si-Cu metasurfaces to address this issue. This metasurface emitter is designed to support two nondispersive magnetic polariton modes that exhibit distinct directional thermal emission profiles, thus enabling dual-band detection without the need of optical filters. Specifically, we evaluate the feasibility of such dual-band filterless detection by adapting the metasurface emitter to CO2 sensing. The model of sensing system shows a selective relative sensitivity of CO2 which is 3.2 times higher than that using a blackbody emitter, and a relative sensitivity of temperature of emitter about 1.32%/K.
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