Although great progress has been made in stealth research based on metamaterial/metasurface, it is still a great challenge to achieve broadband, wide-angle and full polarization stealth at the same time. In this paper, a metasurface carpet cloak based on graphene rings is proposed to address this issue. Simulation results demonstrate that the arched carpet cloak can achieve a polarization-insensitive invisibility with a large working bandwidth of 45% and a wide angular span of ±40° in terahertz range. The cloaking bandwidth can be further increased to 60% by adjusting graphene Fermi energy to control the phase dispersion of meta-atoms. By comparing the arched and triangular carpet cloaks and the arched carpet cloaks with different curvature, the sensitivity of cloaking performance to the shape of carpet cloak is demonstrated. The metasurface based on graphene ring can not only give a good solution for broadband, wide-angle and polarization-insensitive invisibility in terahertz to mid-infrared region, but also provide inspiration for the construction of other metasurface devices with excellent performance.

尽管基于超材料/超表面的隐身研究取得了很大进展，但同时实现宽带、广角和全极化隐身仍然是一个巨大的挑战。在本文中，提出了一种基于石墨烯环的超表面地毯斗篷来解决这个问题。仿真结果表明，拱形地毯斗篷可以在太赫兹范围内实现45%的大工作带宽和±40°的宽角跨度，实现偏振不敏感隐身。通过调节石墨烯费米能量来控制元原子的相色散，隐身带宽可以进一步提高到60%。通过比较拱形和三角形的地毯斗篷和不同曲率的拱形地毯斗篷，证明了斗篷性能对地毯斗篷形状的敏感性。