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Hybrid Metamaterial Absorber Platform for Sensing of CO2 Gas at Mid‐IR
Advanced Science ( IF 14.3 ) Pub Date : 2018-02-21 , DOI: 10.1002/advs.201700581
Dihan Hasan 1, 2, 3 , Chengkuo Lee 1, 2, 3, 4
Affiliation  

Application of two major classes of CO2 gas sensors, i.e., electrochemical and nondispersive infrared is predominantly impeded by the poor selectivity and large optical interaction length, respectively. Here, a novel “hybrid metamaterial” absorber platform is presented by integrating the state‐of‐the‐art complementary metal–oxide–semiconductor compatible metamaterial with a smart, gas‐selective‐trapping polymer for highly selective and miniaturized optical sensing of CO2 gas in the 5–8 µm mid‐IR spectral window. The sensor offers a minimum of 40 ppm detection limit at ambient temperature on a small footprint (20 µm by 20 µm), fast response time (≈2 min), and low hysteresis. As a proof‐of‐concept, net absorption enhancement of 0.0282%/ppm and wavelength shift of 0.5319 nm ppm−1 are reported. Furthermore, the gas‐ selective smart polymer is found to enable dual‐mode multiplexed sensing for crosschecking and validation of gas concentration on a single platform. Additionally, unique sensing characteristics as determined by the operating wavelength and bandwidth are demonstrated. Also, large differential response of the metamaterial absorber platform for all‐optical monitoring is explored. The results will pave the way for a physical understanding of metamaterial‐based sensing when integrated with the mid‐IR detector for readout and extending the mid‐IR functionalities of selective polymers for the detection of technologically relevant gases.

中文翻译:


用于中红外二氧化碳气体传感的混合超材料吸收器平台



两大类CO 2气体传感器,即电化学传感器和非色散红外传感器的应用主要分别受到差的选择性和大的光学相互作用长度的阻碍。这里,提出了一种新颖的“混合超材料”吸收器平台,将最先进的互补金属氧化物半导体兼容超材料与智能气体选择性捕获聚合物相结合,用于 CO 2的高选择性和小型化光学传感5-8 µm 中红外光谱窗口中的气体。该传感器在环境温度下提供最小 40 ppm 的检测限,占地面积小(20 µm x 20 µm),响应时间快(约 2 分钟),并且滞后性低。作为概念验证,报告称净吸收增强为 0.0282%/ppm,波长偏移为 0.5319 nm ppm -1 。此外,气体选择性智能聚合物可以实现双模式多重传感,以便在单一平台上交叉检查和验证气体浓度。此外,还展示了由工作波长和带宽决定的独特传感特性。此外,还探索了用于全光监测的超材料吸收器平台的大差分响应。当与中红外探测器集成进行读出时,这些结果将为基于超材料的传感的物理理解铺平道路,并扩展选择性聚合物的中红外功能以检测技术相关的气体。
更新日期:2018-02-21
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