ABSTRACT We investigate THz absorption characteristics of graphene cavity-based electromagnetic metamaterial structures by using the conductivity characteristic matrix method. We demonstrate that the proposed structure can obtain ideal terahertz absorption due to the strong localization of photons in the defect layer of the electromagnetic metamaterial structure. The THz absorption can be continuously adjusted from 0% to 100% by controlling the chemical potential of graphene through a gate voltage. The maximum THz absorption value can be tailored by adjusting the incident angle or the period number of the two PCs with respect to the graphene layer. The position of the THz absorption peak can be adjusted by changing the thickness ratio of the layers constituting the electromagnetic metamaterial structure. Our proposal may have potentially important applications in photodetectors, saturable absorbers, and photovoltaics.

中文翻译：

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基于石墨烯腔的电磁超材料结构的增强的太赫兹吸收

摘要 我们使用电导特性矩阵方法研究了基于石墨烯腔的电磁超材料结构的太赫兹吸收特性。我们证明，由于光子在电磁超材料结构的缺陷层中的强定位，所提出的结构可以获得理想的太赫兹吸收。通过栅极电压控制石墨烯的化学势，可以在 0% 到 100% 范围内连续调节太赫兹吸收。可以通过调整两个 PC 相对于石墨烯层的入射角或周期数来定制最大太赫兹吸收值。可以通过改变构成电磁超材料结构的层的厚度比来调整太赫兹吸收峰的位置。