论文标题
可调石墨烯拆分谐振器
Tunable Graphene Split-Ring Resonators
论文作者
论文摘要
分裂环谐振器是超材料中元原子的原型。尽管已经对基于高贵的金属的分裂谐振器进行了广泛的研究，但最新的是，没有实验证明由石墨烯制成的分裂环谐振器，石墨烯是一种新兴的引人入胜的等离子材料。在这里，我们在实验中证明了具有深度亚波长（约占激发波长的一百个）磁偶极子响应的石墨烯拆分谐振器。同时，根据入射光极化，观察到四极杆和电偶极子。所有模式都可以通过化学掺杂或堆叠多个石墨烯层调节。与SiO2底物的表面极性声子的强相互作用也显着改变了响应。有限元频域模拟很好地再现了实验结果。我们的研究将一个大步向前移动到多功能石墨烯超材料，除了仅具有电偶极共振的简单石墨烯色带或磁盘阵列外。
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.
