设计了一种基于TiO2介质的全介质电磁诱导透明超表面模型, 该结构由两根十字垂直交叉的介质棒和四个介质方块组成.在入射电磁场的作用下, 介质棒中直接被入射电磁场激励的米氏电谐振通过相互耦合作用激发了介质方块中的磁共振, 并产生谐振模之间的相消干涉, 从而产生了类电磁诱导透明现象.利用电磁仿真软件和双谐振子耦合模理论, 模拟计算和定量分析了类电磁诱导透明效应, 结果表明: 在电磁波正入射下, 该结构在0.552 THz处产生一透射率接近96%的透明窗口.由于其结构单元具有4度旋转对称性和多个暗模谐振元素, 使得诱导透明效应出现较宽频带且呈现出对入射电场极化方向不敏感的特性.

Classical analogy of electromagnetically induced transparency-like effect was demonstrated by a all-dielectric metasurface structure based on TiO2, which composed of two cross perpendicular dielectric bars and four dielectric bricks. Under the excitation of incident electromagnetic field, electric Mie resonance, which is directly excited by the incident electromagnetic field in the dielectric bar, can excite the magnetic Mie resonance in the dielectric bricks by the interaction of each other, and then produce the destructive interference between the resonant modes, thus the phenomenon of electromagnetic induced transparency occurs. By using the simulation software and the "two oscillators" coupled model, the simulation calculation and quantitative analysis of the electromagnetic induced transparency effect were both carried out. Results show that a transparent window with a transmittance of nearly 96% is generated at 0.552 THz under the normal incidence of electromagnetic wave. Owing to its C4 rotation symmetric and multiple dark mode resonant elements of the proposed structure, the induced transparency effect is characterized by a broadband transparency window and insensitive to the incident electric field polarization.