A metamaterial- and graphene-based broadband terahertz (THz) electromagnetic wave absorber that is composed of a stack of patterned gold film layer, patterned graphene layer, polyimide layer, and silicon layers was studied in detail. Our study is based on numerical simulations and electromagnetic absorption level higher than 90% over 2.09 THz band was demonstrated. The absorption frequency band significantly depends on the thickness of the polyimide layer and red shifts in parallel with its thickness. The major role of the added patterned graphene layer is to introduce frequency tunability property to the almost perfect absorption. As the Fermi level of graphene changed from 0 to 0.6 eV, the center frequency of the absorption band blueshifts from 6.19 to 8.15 THz. We also investigated incoming beam angle of incidence dependence and polarization sensitivity of the absorption. Metamaterial-based tunable absorbers prospected to be utilized in high-performance THz devices as a performance boosting critical element.

中文翻译：

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在太赫兹区域设计基于超材料和石墨烯的可调谐宽带电磁吸收器

详细研究了一种基于超材料和石墨烯的宽带太赫兹 (THz) 电磁波吸收器，该吸收器由堆叠的图案化金膜层、图案化石墨烯层、聚酰亚胺层和硅层组成。我们的研究基于数值模拟，并且证明了在 2.09 THz 频段上的电磁吸收水平高于 90%。吸收频带显着取决于聚酰亚胺层的厚度和与其厚度平行的红移。添加的图案化石墨烯层的主要作用是为几乎完美的吸收引入频率可调特性。随着石墨烯的费米能级从 0 到 0.6 eV，吸收带的中心频率从 6.19 到 8.15 THz 蓝移。我们还研究了入射光束角的入射依赖性和吸收的偏振敏感性。基于超材料的可调谐吸收器有望在高性能太赫兹设备中用作提高性能的关键元素。