Utilizing a double bias scheme for graphene patterns as a single layer, a THz meta‐surface structure is proposed. The structure includes two dual bias layers and a graphene continuous sheet on top. So five possible biases are available which lead to a highly tunable absorption response. All consisting parts are modeled via passive circuit elements to obtain whole device input impedance. Then impedance matching theory is used to investigate potential frequencies for perfect absorption. Also, ample simulations are performed to show the validity and accuracy of theoretical descriptions. According to the simulation results in the conventional finite element method as a reference approach is in acceptable agreement with the developed circuit model approach. The proposed structure shows nearly perfect absorption in 5, 6, 7, and 8 THz with absorption rate over 90%. Such a tunable reaction is in incredible requests in optical systems and has various applications in structuring sensors, modulators, and photonic functions.

中文翻译：

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高度可调的多频段太赫兹吸收器，具有使用多偏置方案的电路模型表示

利用石墨烯图案的双偏压方案作为单层，提出了太赫兹超表面结构。该结构在顶部包括两个双偏压层和一个石墨烯连续片。因此，有五个可能的偏差可导致高度可调的吸收响应。所有组成部分均通过无源电路元件建模以获得整个设备的输入阻抗。然后，使用阻抗匹配理论来研究潜在频率以实现完美吸收。同样，进行了充分的仿真以显示理论描述的有效性和准确性。根据仿真结果，以常规有限元法作为参考方法与开发的电路模型方法是可以接受的。所提议的结构在5、6、7中显示出近乎完美的吸收 8 THz，吸收率超过90％。在光学系统中，这种可调谐的反应是令人难以置信的要求，并且在构造传感器，调制器和光子功能方面具有各种应用。