In this study, we propose and investigate a generalized circuit model for metasurface high-sensitivity sensors and broadband absorbers. First, we propose a terahertz tunable and polarization-independent high-sensitivity sensor based on a bulk Dirac semimetal metasurface. We compare the results of the proposed circuit model with those of full-wave simulation. In addition, we achieve the spectra of the sensor absorption for healthy and cancer cells. Moreover, since for most practical applications, the absorption bandwidth is one of the most substantial metrics, we propose a broadband absorber in the wavelength range of 600 to 800 nm. To verify our proposed model, we compare the results of the circuit model with those of experimental data. Additionally, a good agreement is observed among the results of the circuit model, those of full-wave simulations, and the experimental data. The proposed circuit model is general. It provides physical insight into the design and operation of various sub-wavelength structures in the broad frequency range. In addition, the proposed sensor can be used as a platform for the design of sensors needed in various chemical and biomedical systems.

中文翻译：

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超表面高灵敏度传感器和吸收器的稳健设计方法

在这项研究中，我们提出并研究了超表面高灵敏度传感器和宽带吸收器的广义电路模型。首先，我们提出了一种基于体Dirac半金属超表面的太赫兹可调和偏振无关的高灵敏度传感器。我们将所提出的电路模型的结果与全波仿真的结果进行比较。此外，我们获得了健康细胞和癌细胞的传感器吸收光谱。此外，由于对于大多数实际应用而言，吸收带宽是最重要的指标之一，因此我们建议在600至800 nm波长范围内使用宽带吸收器。为了验证我们提出的模型，我们将电路模型的结果与实验数据进行了比较。此外，在电路模型的结果中观察到了很好的一致性，全波模拟和实验数据。所提出的电路模型是通用的。它提供了对较宽频率范围内各种亚波长结构的设计和操作的物理洞察力。另外，提出的传感器可以用作设计各种化学和生物医学系统中所需的传感器的平台。