A dual narrow band perfect THz absorber is presented in this work. The structure includes three layers of graphene ribbons, disks, and sheet on the TOPAS dielectric layer while a golden plate is placed at the bottom to act as a fully reflecting mirror against THz waves. According to the simulations, the device is robust enough to show independent operation versus layers thicknesses variations, chemical potentials mismatches, and changing of electron relaxation time. The designed THz absorber in this work is an appropriate basic block for several applications in THz optical systems such as sensors, detectors, and modulators. The layers in the proposed device are modeled via passive circuit elements and consequently, the equivalent circuit of the device is calculated. Leveraging developed circuit model and impedance matching concept, the proposed device is designed to perfect absorption at 1 THz and 7 THz. Ample simulations are performed using MATLAB and CST to verify the superior performance of the device. The presented manuscript considers the circuit model representation for three different layers of the device. For a unique structure, highly tunable response versus chemical potential is obtained. Circuit model approach and impedance matching theory are exploited to reduce computational time regarding conventional approaches.

这项工作提出了一个双窄带完美太赫兹吸收器。该结构在TOPAS介电层上包括三层石墨烯带，圆盘和薄板，同时在其底部放置了一块金板，以充当针对THz波的全反射镜。根据仿真，该器件足够坚固，可以显示独立的操作，而各层的厚度变化，化学势失配以及电子弛豫时间的变化均不明显。这项工作中设计的太赫兹吸收器是太赫兹光学系统中多种应用（例如传感器，检测器和调制器）的合适基本模块。拟议设备中的各层是通过无源电路元件建模的，因此，计算了设备的等效电路。利用开发的电路模型和阻抗匹配概念，拟议中的设备旨在完美吸收1 THz和7 THz的吸收。使用MATLAB和CST进行了大量的仿真，以验证该器件的优越性能。提出的手稿考虑了器件三个不同层的电路模型表示。对于独特的结构，可以获得相对于化学势而言高度可调的响应。利用电路模型方法和阻抗匹配理论来减少传统方法的计算时间。获得了相对于化学势的高度可调的响应。利用电路模型方法和阻抗匹配理论来减少传统方法的计算时间。获得了相对于化学势的高度可调的响应。利用电路模型方法和阻抗匹配理论来减少传统方法的计算时间。