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arXiv 2008.01577physics.app-phcond-mat.mes-hall
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可调谐石墨烯开口环谐振器

Tunable Graphene Split-Ring Resonators

Qiaoxia Xing, Chong Wang, Shenyang Huang, Tong Liu, Yuangang Xie, Chaoyu Song, Fanjie Wang, Xuesong Li, Lei Zhou, Hugen Yan

发表信息：
Phys. Rev. Applied 13, 4, 041006 (2020)
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摘要：

开口环谐振腔是超材料中超原子的原型。虽然基于贵金属的开口环谐振器已经被广泛研究，但到目前为止，还没有实验证明由石墨烯制成的开口环谐振器，石墨烯是一种新兴的有趣的等离子体材料。在这里，我们实验证明石墨烯开口环谐振器与深亚波长（约百分之一的激发波长）磁偶极子响应在太赫兹制度。同时，观察到四极和电偶极子，依赖于入射光的偏振。所有模式都可以通过化学掺杂或堆叠多个石墨烯层来调节。与SiO2衬底的表面极性声子的强相互作用也显著地修改响应。有限元频域模拟很好地再现了实验结果。我们的研究向多功能石墨烯超材料迈进了一步，超越了简单的石墨烯带或仅具有电偶极共振的圆盘阵列。

英文摘要：

A split-ring resonator is a prototype of meta-atom in metamaterials. Though noble metal-based split-ring resonators have been extensively studied, up to date, there is no experimental demonstration of split-ring resonators made from graphene, an emerging intriguing plasmonic material. Here, we experimentally demonstrate graphene split-ring resonators with deep subwavelength (about one hundredth of the excitation wavelength) magnetic dipole response in the terahertz regime. Meanwhile, the quadrupole and electric dipole are observed,depending on the incident light polarization. All modes can be tuned via chemical doping or stacking multiple graphene layers. The strong interaction with surface polar phonons of the SiO2 substrate also significantly modifies the response. Finite-element frequency domain simulations nicely reproduce experimental results. Our study moves one stride forward toward the multi-functional graphene metamaterials, beyond simple graphene ribbon or disk arrays with electrical dipole resonances only.

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