A tunable graphene-based hyperbolic metamaterial is designed and numerically investigated in the mid-infrared frequencies. Theoretical analysis proves that by adjusting the chemical potential of graphene from 0.2 eV to 0.8 eV, the reflectance can be blue-shifted up to 2.3 µm. Furthermore, by modifying the number of graphene monolayers in the hyperbolic metamaterial stack, we are able to shift the plasmonic resonance up to 3.6 µm. Elliptic and type II hyperbolic dispersions are shown for three considered structures. Importantly, a blue/red-shift and switching of the reflectance are reported at different incident angles in TE/TM modes. The obtained results clearly show that graphene-based hyperbolic metamaterials with reversibly controlled tunability may be used in the next generation of nonlinear tunable and reversibly switchable devices operating in the mid-IR range.

中文翻译：

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基于石墨烯的双曲超材料作为可切换反射调制器

设计了可调谐的基于石墨烯的双曲超材料，并在中红外频率下进行了数值研究。理论分析证明，通过将石墨烯的化学势从0.2 eV调整到0.8 eV，反射率可以蓝移至2.3 µm。此外，通过修改双曲线超材料堆栈中石墨烯单层的数量，我们能够将等离子共振移动到3.6 µm。给出了三种考虑的结构的椭圆和II型双曲分散。重要的是，在TE / TM模式下，入射角在不同入射角时发生蓝/红移和反射率切换。