共隙连接方形开口环谐振器体视材料的谐振模式
Resonance modes in stereometamaterial of square split ring resonators connected by sharing the gap
摘要：
立体变形天线可以充分利用3D自由度来利用多个开口环谐振器（SRR）之间的耦合和混合，从而实现比其平面对应物更非凡的谐振和特性。在这里，我们提出并数值研究了一种结构的基础上连接SRRs共享其间隙在旋转的方式。结果表明，在通信和近红外波段，笼状SRR（C-SRR）立体超材料存在三种典型的谐振模式。按照能量增加的顺序，这些模式基本上可以归因于磁环偶极子，磁偶极子，以及电偶极子和磁环偶极子的混合。我们发现，后两个是来自相应的个人SRR的二阶模式，而第一个从基本的。由于高阶特征和旋转对称性，最高能量模式在单个C-SRR中保持相对“暗”。然而，它们在C-SRR阵列中都很容易激发，提供多频带滤波功能。
英文摘要：
Stereometamaerials can fully utilize the 3D degrees of freedom to exploit the coupling and hybridization between multiple split ring resonators (SRRs), enabling more extraordinary resonances and properties over their planar counterparts. Here we propose and numerically study a kind of structure based on connected SRRs sharing their gap in a rotational fashion. It is shown that there are three typical resonance modes in such cage-like SRR (C-SRR) stereometamaterial in the communication and near infrared range. In the order of increasing energy, these modes can be essentially ascribed to magnetic torodial dipole, magnetic dipole, and a mixture of electric-dipole and magnetic toroidal dipole. We show that the latter two are derived from the second-order mode in the corresponding individual SRR, while the first one from the fundamental one. The highest energy mode remains relatively "dark" in an individual C-SRR due to the high-order feature and the rotational symmetry. However, they are all easily excitable in a C-SRR array, offering multiband filtering functionality.
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