Graphene‐based tunable terahertz electromagnetically induced transparency using metamaterial structure
Graphene‐based tunable terahertz electromagnetically induced transparency using metamaterial structure
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DOI：
10.1002/mop.33398
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发表时间：
2022-07
影响因子：
1.5
通讯作者：
K. Xu;Sheng xia;Yijun Cai;Jianxing Li;Jianlei Cui;Chengying Chen;Jianmei Zhou
中科院分区：
文献类型：
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作者：
K. Xu;Sheng xia;Yijun Cai;Jianxing Li;Jianlei Cui;Chengying Chen;Jianmei Zhou
提出了一种基于石墨烯的可调谐电磁感应透明（EIT）类超材料结构，并对其进行了数值分析。超材料结构的单元格由开口环谐振器和双折线对谐振器组成，分别表现为准暗模式和亮模式。当入射波垂直照射在超材料结构上时，可以观察到透射峰。此外，透明窗口的频率可以通过改变石墨烯的费米能级来灵活地调节。采用经典的耦合双振子模型，从理论上分析了类EIT现象的物理机制，即亮模和准暗模之间的近场耦合效应。所提出的工作将是一个很好的候选人设计不同的石墨烯基可调谐EIT器件在不同的频谱与潜在的应用在光学传感器。
A graphene‐based tunable electromagnetically induced transparency (EIT)‐like metamaterial structure operating at the terahertz regime is proposed and numerically analyzed. The unit cell of the metamaterial structure consists of a split‐ring resonator and twofolded‐line pair resonators, performing as the quasi‐dark mode and bright mode, respectively. When the incident waves vertically illuminate upon the metamaterial structure, a transmission peak can be observed. Moreover, the frequency of the transparency window can be flexibly adjusted by changing the Fermi energy level of graphene. A classical coupled two‐oscillator model is employed to theoretically analyze the physical mechanism of EIT‐like phenomenon, which is due to the near‐field coupling effect between the bright and the quasi‐dark modes. The proposed work will be a good candidate for the design of different graphene‐based tunable EIT devices at different frequency spectra with potential applications in optical sensors.