Anapole metamaterials have attracted growing attention in recent years due to their unique nonradiating and nontrivial properties. Although anapole modes have been demonstrated in metamaterials with three-dimensional structures, the design and realization of planar anapole metamaterials in a wide frequency range is still a big challenge. Here we propose and experimentally demonstrate a planar anapole metamaterial consisting of dumbbell-shaped apertures on a stainless-steel sheet at terahertz frequencies. The planar metamaterial can generate a resonant transparency in the terahertz spectrum due to the excitation of the anapole mode. Particularly, the frequency of anapole-induced resonant transparency can be tuned easily in the range of 0.15–0.93 THz by simply varying one geometric parameter of the dumbbell apertures. We anticipate that the resonant transparency in planar anapole metamaterials can be potentially used in filters, sensors, or other photonic devices.

中文翻译：

---

太赫兹频率下的平面偶极子超材料的共振透明性

近年来，无极超材料由于其独特的非辐射性和非平凡特性而受到越来越多的关注。尽管在具有三维结构的超材料中已经证明了偶极子模式，但是在宽频率范围内平面偶极子超材料的设计和实现仍然是一个巨大的挑战。在这里，我们提出并通过实验演示了一种平面偶极子超材料，该材料由太赫兹频率上的不锈钢板上的哑铃状孔组成。由于偶极模式的激发，平面超材料可以在太赫兹光谱中产生共振透明性。特别是，通过简单地改变哑铃孔的一个几何参数，可以容易地在0.15-0.93 THz的范围内调整偶极感应共振的频率。