Abstract Based on photonic topological transition (PTT), the dynamically tunable angular optical transparency of graphene-based hyperbolic metamaterials is theoretically and numerically investigated in mid-infrared region. The results indicate that an ultra-narrow angular optical transparency window with angular full width at half maximum of 0.8° appears near the transition point of PTT for TM waves, which is achieved by tailoring the metamaterial's equi-frequency surface from closed ellipsoid to open hyperboloid. In addition, we further propose the application of TM-pass/TE-reflect polarization beam splitter in the case of normal incidence. Besides, the broadband of angular optical transparency can be realized by changing the Fermi level of graphene.

中文翻译：

---

石墨烯基双曲超材料中由光子拓扑跃迁引起的动态可调角光学透明度

摘要 基于光子拓扑跃迁（PTT），在中红外区域对石墨烯基双曲超材料的动态可调角光学透明度进行了理论和数值研究。结果表明，在 TM 波的 PTT 过渡点附近出现了一个半角全宽为 0.8°的超窄角光学透明窗口，这是通过将超材料的等频表面从闭合椭圆体剪裁成开放双曲面来实现的. 此外，我们进一步提出在法向入射情况下应用TM-pass/TE-反射偏振分束器。此外，通过改变石墨烯的费米能级，可以实现角光透明度的宽带化。