Lee Hsueh-Shun, Kuang Yu-Ping, Lu Cheng-Yu, Yen Ta-Jen, Huang Tsung-Yu
Department of Materials Engineering, Ming Chi University of Technology, R.O.C, New Taipei, 243303, Taiwan.
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 300044, R.O.C, Taiwan.
Sci Rep. 2024 Nov 9;14(1):27328. doi: 10.1038/s41598-024-78633-7.
Higher sensitivity with specific recognition of a sensor could ease the burden of sample purification or labelling procedure for specific testing and detection and there appear two methods including surface enhanced infrared absorption (SEIRA) and surface enhanced Raman scattering (SERS), promising better sensitivity and specificity, simultaneously, via detection of molecular footprints. Furthermore, researchers employ Fano resonance to further boost the detection limit of SEIRA by coupling between two absorption bands from molecules and metamaterials. Still, the current metamaterial absorbers are almost narrow band and require a specific design, only suitable for limited chemicals. Thus, in this work, we would like to design a broadband oblique-wire-bundle (OWB) metamaterial absorber (MA) which could interact with multiple functional groups' absorption from a sample, thus easing the burden of custom-made resonators. In experiments, indeed, our designed OWB MA developed four Fano resonance responses with three PMMAs' functional groups and one function group from carbon dioxide. The counterpart planar MA also performed SEIRA yet without occurrence of Fano resonance as a comparison. We believe this proposed OWB MA could facilitate the development of rapid detection in the field of food safety and chemical detection.
具有特定识别能力的传感器若具备更高的灵敏度，可减轻特定测试和检测中样品纯化或标记程序的负担，目前出现了两种方法，即表面增强红外吸收（SEIRA）和表面增强拉曼散射（SERS），有望通过检测分子足迹同时实现更高的灵敏度和特异性。此外，研究人员利用法诺共振，通过分子与超材料的两个吸收带之间的耦合，进一步提高SEIRA的检测限。然而，目前的超材料吸收体几乎都是窄带的，需要特定设计，仅适用于有限的化学物质。因此，在这项工作中，我们希望设计一种宽带斜线束（OWB）超材料吸收体（MA），它可以与样品中多个官能团的吸收相互作用，从而减轻定制谐振器的负担。在实验中，我们设计的OWB MA确实与三种聚甲基丙烯酸甲酯（PMMAs）的官能团以及二氧化碳的一个官能团产生了四种法诺共振响应。作为对比，对应的平面MA也表现出了SEIRA，但没有出现法诺共振。我们相信，这种提出的OWB MA能够推动食品安全和化学检测领域快速检测技术的发展。
