Liu Zhongmin, Guo Liang, Zhang Qingmao
Opt Express. 2021 Nov 22;29(24):39777-39787. doi: 10.1364/OE.442425.
We present a novel and effective approach for designing and analyzing graphene metasurface-based terahertz absorbers with the desired central frequency and fractional bandwidth. Narrowband and broadband absorbers are designed using the same configuration with a single-layer of graphene ribbons deposited on a metal-backed dielectric film. An analytical circuit model derived for the graphene array applies the impedance matching concept to realize the desired terahertz absorber. Absorbers with a fractional bandwidth ranging from 10-100% are realized at the 1-THz central frequency. The results show excellent agreement with those calculated using full-wave numerical simulations. The proposed method is promising for terahertz imaging, sensing, and filtering applications.
我们提出了一种新颖且有效的方法，用于设计和分析具有所需中心频率和分数带宽的基于石墨烯超表面的太赫兹吸收器。窄带和宽带吸收器采用相同的配置进行设计，即在金属背衬介电膜上沉积单层石墨烯带。为石墨烯阵列推导的分析电路模型应用阻抗匹配概念来实现所需的太赫兹吸收器。在1太赫兹的中心频率下实现了分数带宽范围为10 - 100%的吸收器。结果与使用全波数值模拟计算的结果显示出极好的一致性。所提出的方法在太赫兹成像、传感和滤波应用方面具有前景。
