Active manipulation of dual transparency windows in dark–bright–dark mode coupling graphene metamaterial

Active manipulation of dual transparency windows for EIT metamaterial in dark–bright–dark coupling mode, which is constructed by three graphene patterns, including graphene strip and two asymmetrical double-split graphene ring resonators, is numerically and theoretically investigated in terahertz re...

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Bibliographic Details
Published in:Optics communications 2021-06, Vol.488, p.126851, Article 126851
Main Authors: Mei, Jinshuo, Song, Chenglong, Shu, Chang
Format: Article
Language:English
Subjects:
Active manipulation
Dual transparency windows
EIT
Graphene
Metamaterial
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Summary:Active manipulation of dual transparency windows for EIT metamaterial in dark–bright–dark coupling mode, which is constructed by three graphene patterns, including graphene strip and two asymmetrical double-split graphene ring resonators, is numerically and theoretically investigated in terahertz regime. Simulation results illustrate that the causation of dual-windows EIT phenomenon is the near field coupling of two adjacent graphene patterns in the unit cell which acted as dark and bright mode respectively. In addition, dual transparency windows of EIT can be actively and selectively tuned to realize red or blue shift via varying of the Fermi energy of the corresponding dark mode element in the unit cell. Meanwhile, when the Fermi energies of dark mode elements are shifting inversely, dual transparency windows could be actively modified to single transparency window or even disappeared. •A tunable EIT structure base on graphene is proposed.•Modification between single and dual transparency windows.•Classical three-oscillator is employed.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2021.126851