中图分类号：043 文献标志码：A

Polarization-independent electromagnetically induced transparency-like effects in metasurface

Abstract： To address the issue that the traditional electromagnetically induced transparency （EIT）-like structure is highly dependent on the polarization state incident light， a polarization-independent EITlike metasurface structure was designed using electromagnetic field simulation stware coupled mode theory， achieving stable transmission spectral responses arbitrary polarization directions. The metasurface was composed four metalic triangular rings four metallic strips， arranged on a dielectric substrate with fourfold rotational symmetry. The polarization-independent EIT-like phenomenon was caused by the destructive interference two bright resonances from the metalic triangular rings metallic strips. Numerical simulation results show that the metasurface exhibits an EIT-like window around 10.55GHz with a slow-wave group delay time O.46 ns. By adjusting the geometric parameters the metasurface， the EIT-like frequency corresponding slow-wave group delay can be flexibly tuned. This design lays a solid foundation the practical applications EIT-like phenomena in optical sensing， slow-light devices， optical communication systems across multiple scenarios. Additionally， it can also be extended to other frequency bs， holding potential polarization-independent filtering， sensing， nonlinear effect applications.

Keywords： electromagnetically induced transparency; metasurface; slow-wave; polarizationindependent; tunable

超材料是人工设计的结构材料[1-2]。近 20年来，超材料凭借其独特的电磁场调控能力（如负折射[3-4]和隐形斗篷[5]等），已成为科研领域的研究热点，受到广泛关注。同时，在凝聚态物理和量子光学新概念的启发下，超材料为研究波与物质的相互作用提供了新的思路。比如光子拓扑绝缘体激光器的实现、谷光子路由器以及基于电磁诱导透明的波延迟和存储[-]等。

电磁感应透明（electromagneticallyinducedtransparency，EIT）现象是一种经典原子量子干涉现象，可实现低损耗传输和强色散效应[10-12]。这种强色散特性可以显著降低群速度和增强非线性效应[13]。然而，量子电磁感应透明现象的实现需要特殊且复杂的实验条件，如低温和高强度激光。最近，在微波、太赫兹和光学频段，基于超材料实现了类电磁感应透明现象。其中，超表面因其易于加工和便于使用而备受关注[14-20]。

最早流行的类电磁感应透明现象由相同频率的亮共振和暗共振直接近场耦合形成[21-22]，其物理原理是经典系统中不同等效“原子”路径之间的相消干涉效应。另一种方法是利用2个间接远场耦合的亮共振来实现电磁感应透明现象。实验原理是将电磁感应透明现象的谱线视为由2个紧密间隔的共振态共同构成[23]。值得注意的是，无论采用哪种方案，早期报道的类电磁感应透明现象通常都高度依赖于人射波的极化态，这些结构中的共振模式与极化有关[24-25]，极大地限制了实际应用。

近年来，多种平面超构晶格结构被设计出来，如五环结构[26]、分裂环结构[27]和风车状结构[28]。……