Journal
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
Volume 64, Issue 11, Pages 1917-1922Publisher
WILEY
DOI: 10.1002/mop.33398
Keywords
electromagnetically induced transparency; graphene; metamaterials; terahertz
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Funding
- Siyuan Scholar Fellowship of XJTU
- National Natural Science Foundation of China [U2130102, 62005232]
- Opening Project of Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences
- Xiamen Science and Technology Project [3502Z20173042]
- Natural Science Foundation of Fujian Province [2020J01294]
- State Key Laboratory of Advanced Optical Communication Systems Networks [2022GZKF020]
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A tunable electromagnetic induced transparency (EIT)-like metamaterial structure based on graphene is proposed and analyzed in the terahertz regime. The structure consists of a split-ring resonator and twofolded-line pair resonators, serving as the quasi-dark mode and bright mode, respectively. The frequency of the transparency window can be adjusted by changing the Fermi energy level of graphene. The physical mechanism of EIT-like phenomenon is explained using a coupled two-oscillator model, which attributes it to the near-field coupling effect between the bright and quasi-dark modes.
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.
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