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.

在太赫兹状态下，在数值上和理论上研究了在暗-明-暗耦合模式下对EIT超材料的双透明窗口的主动操纵，该窗口由三个石墨烯图案（包括石墨烯带和两个非对称双分裂石墨烯环形谐振器）构成。仿真结果表明，双窗EIT现象的起因是晶胞中两个相邻石墨烯图案的近场耦合，分别充当暗模式和亮模式。另外，可以通过改变单位晶格中相应暗模式元件的费米能量来主动和选择性地调整EIT的双透明度窗口，以实现红移或蓝移。同时，当暗模式元素的费米能量反向移动时，