The magnetic response of graphene split-ring metamaterials
The magnetic response of graphene split-ring metamaterials
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DOI：
10.1038/lsa.2013.34
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发表时间：
2013-07-01
影响因子：
19.4
通讯作者：
Garcia de Abajo, F. J.
中科院分区：
文献类型：
--
作者：
Papasimakis, Nikitas;Thongrattanasiri, Sukosin;Garcia de Abajo, F. J.
石墨烯已经成为一个有前途的平台，太赫兹等离子体，允许高约束，长寿命和快速的电调谐。在这里，我们预测了石墨烯分裂纳米环在太赫兹频率下的强磁偶极子响应，从而实现了具有高度场约束（约为激发波长的百分之一）的超材料，这是传统贵金属无法达到的。高掺杂石墨烯开口环在远红外中的磁响应比类似厚度的金结构所显示的磁响应强得多。我们进一步探索了堆叠的石墨烯层作为在薄的电可调超材料中产生高频磁性的实用方法。我们的研究结果支持了利用石墨烯实现电调谐磁性超材料的巨大潜力。
Graphene has emerged as a promising platform for THz plasmonics, allowing high confinement, long lifetimes and fast electrical tunability. Here, we predict a strong magnetic dipole response by graphene split nanorings at THz frequencies, allowing the attainment of metamaterials with a high degree of field confinement (approximately one hundredth of the excitation wavelength) that is not reachable with conventional noble metals. The magnetic response of highly doped graphene split-rings in the far-infrared is much stronger than that displayed by gold structures of similar thicknesses. We further explored stacked graphene layers as a practical way of producing high-frequency magnetism in thin, electrically tunable metamaterials. Our results support the great potential of using graphene to achieve electrically tunable magnetic metamaterials.