Mimicking glide symmetry dispersion with coupled slot metasurfaces
Mimicking glide symmetry dispersion with coupled slot metasurfaces
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DOI：
10.1063/1.5000222
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发表时间：
2017-09-18
影响因子：
4
通讯作者：
Quevedo-Teruel, Oscar
中科院分区：
文献类型：
--
作者：
Camacho, Miguel;Mitchell-Thomas, Rhiannon C.;Quevedo-Teruel, Oscar
在这封信中，我们证明了通过平衡两个子晶格的影响，可以在仅具有反射对称性的系统中实现与滑移对称性相关的色散特性。我们将这种方法应用于切割成无限完美导电平面的一对耦合槽。每个槽的任一边缘都有凹口，完整的双槽系统仅具有镜像对称性。通过修改槽两侧凹口的相对尺寸，我们表明可以实现布里渊区边界处具有非零群速度的简并性的线性色散关系。到目前为止，这些特性仅在具有滑移对称性的系统中发现，并经过数值和实验验证。我们还表明，这些结果可用于共面波导技术中超宽带一维漏波天线的设计。
In this letter, we demonstrate that the dispersion properties associated with glide symmetry can be achieved in systems that only possess reflection symmetry by balancing the influence of two sublattices. We apply this approach to a pair of coupled slots cut into an infinite perfectly conducting plane. Each slot is notched on either edge, with the complete two-slot system having only mirror symmetry. By modifying the relative size of the notches on either side of the slots, we show that a linear dispersion relation with a degeneracy with non-zero group velocity at the Brillouin zone boundary can be achieved. These properties, until now, only found in systems with glide symmetry are numerically and experimentally validated. We also show that these results can be used for the design of ultra-wideband one-dimensional leaky wave antennas in coplanar waveguide technology.