Appl Opt. 2021 May 1;60(13):3816-3822. doi: 10.1364/AO.421910.
Terahertz metamaterial sensors have received extensive attention in biosensing applications. However, sensitivity toward terahertz frequencies emitted by liquid samples remains challenging because of the strong absorption of terahertz waves by water. Here, we present a highly sensitive terahertz sensor based on a three-dimensional double I-type metamaterial integrated microfluidic channel. The designed sensor produces an inductive-capacitive (LC) resonance with a high quality factor of approximately 72, while demonstrating a maximum sensitivity of 832 GHz/RIU. Furthermore, we analyzed the relationship between the resonance frequency and ethanol concentration. These findings would promote the application of terahertz technology in label-free and rapid biomedical sensing as well as substance detection.
太赫兹超材料传感器在生物传感应用中受到了广泛关注。然而，由于太赫兹波在水中的强吸收，对液体样品发射的太赫兹频率的灵敏度仍然具有挑战性。在这里，我们提出了一种基于三维双 I 型超材料集成微流道的高灵敏度太赫兹传感器。所设计的传感器产生具有约 72 的高品质因数的感性-容性 (LC) 共振，同时表现出最大灵敏度为 832 GHz/RIU。此外，我们分析了共振频率与乙醇浓度之间的关系。这些发现将促进太赫兹技术在无标记和快速生物医学传感以及物质检测中的应用。
