Wang Chen, Li Xinwei, Huang Yuxin, Xu Wendao, Zhou Ruiyun, Wang Ruiqian, Xie Lijuan, Ying Yibin
Opt Express. 2018 Sep 17;26(19):24992-25002. doi: 10.1364/OE.26.024992.
The capability to design, fabricate, and optimize metamaterials based on various structures and material platforms has been crucial for the rapid development of modern terahertz (THz) technology. While the detailed structures of artificial unit cells within a metamaterial is certainly worth investigating, there has been increasing demand to integrate novel metamaterials with a traditional functional photonic device to form a hybrid device, whose performance is so significantly improved as to be promising for real-world applications. In this study, we proposed, for the first time, a THz parallel-plate resonator based on metallic mesh devices (MMDs) for chemical sensing applications. We studied the influences of various structural parameters through simulations, fabricated MMD-based resonator devices, and fully characterized the device performance through THz spectroscopy experiments. Furthermore, we experimentally demonstrated that our device can detect a doxycycline hydrochloride aqueous solution whose concentrations is as low as 1 mg L through resonance frequency shifts, evidencing the device sensitivity capable of delicate chemical sensing tasks. Our work presents a practical and low cost architecture for chemical sensing using THz radiation, which opens new avenues for numerous useful THz devices based on metamaterials.
基于各种结构和材料平台设计、制造和优化超材料的能力，对现代太赫兹（THz）技术的快速发展至关重要。虽然超材料中人工单元胞的详细结构确实值得研究，但将新型超材料与传统功能性光子器件集成以形成混合器件的需求日益增加，这种混合器件的性能得到显著改善，有望用于实际应用。在本研究中，我们首次提出了一种基于金属网器件（MMD）的太赫兹平行板谐振器用于化学传感应用。我们通过模拟研究了各种结构参数的影响，制造了基于MMD的谐振器器件，并通过太赫兹光谱实验全面表征了器件性能。此外，我们通过实验证明，我们的器件可以通过共振频率偏移检测浓度低至1 mg/L的盐酸多西环素水溶液，证明了该器件能够完成精细化学传感任务的灵敏度。我们的工作提出了一种实用且低成本的利用太赫兹辐射进行化学传感的架构，为众多基于超材料的有用太赫兹器件开辟了新途径。
