Data_Sheet_1_A Three-Dimensional Dual-Band Terahertz Perfect Absorber as a Highly Sensitive Sensor.PDF

Terahertz (THz) absorbers are highly desirable in sensing and detection devices. Herein, we have proposed a 3D dual-band near-perfect absorber that works in the THz regime for sensing applications. The theoretical calculation shows that the absorption efficiency of the absorber can reach 99.0 and 97.0% at 1.125 and 1.626 THz, respectively. Double absorption peaks can be tuned independently by alternating the geometric parameters of unit resonators. The underlying physical mechanism of the absorber matches well with the well-known impedance matching theory. Compared with its planar counterpart, our proposed absorber exhibits a figure of merit enhancement of at least two times due to its out-of-plane induced large interfacial area. Additionally, the absorber can work robustly at a wide range of incident angles and keep insensitive to polarization states, which renders it great for highly sensitive sensing.

太赫兹（Terahertz, THz）吸收器在传感与探测器件领域极具应用价值。本文提出了一款工作于太赫兹频段、面向传感应用的三维双波段近完美吸收器。理论计算表明，该吸收器在1.125 THz与1.626 THz处的吸收效率分别可达99.0%与97.0%。通过调整单元谐振器的几何参数，可独立调控两个吸收峰的位置。该吸收器的内在物理机制与经典的阻抗匹配理论高度吻合。相较于平面结构的同类器件，本研究提出的吸收器因面外结构带来的超大界面面积，其品质因数提升至少可达两倍。此外，该吸收器可在宽入射角范围内稳定工作，且对偏振态不敏感，这一特性使其非常适用于高灵敏度传感场景。