It is demonstrated that the direct interaction of plasmonic and lattice modes can lead to Fano-type resonance in a mirrored array of simple split ring resonators. The physics behind the effect is overlapping of the frequencies of the lowest lattice mode and the broadband plasmonic mode, which plays the role of a continuum, whereas the lattice mode manifests itself as a discrete state. The overlapping is achieved by mirror symmetric orientation of two adjacent split ring resonators, which increases the lattice period twice. We have revealed that a further increase in the period of the modified array leads to a shift of the Fano resonance to a lower frequency. High quality factor of Fano resonance, around 100, has been evidenced experimentally.

中文翻译：

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由于裂环共振器的镜像阵列中的等离激元和晶格模式的直接相互作用而产生的法诺共振

结果表明，等离子和晶格模式的直接相互作用可以导致简单裂环谐振器的镜像阵列中的Fano型谐振。该效应背后的物理原理是最低晶格模式和宽带等离子体模式的频率重叠，这起到了连续体的作用，而晶格模式则表现为离散状态。重叠是通过两个相邻的开口环谐振器的镜面对称取向实现的，这使晶格周期增加了两倍。我们已经发现，修改后的阵列周期的进一步增加会导致Fano共振移至更低的频率。实验证明，Fano共振的高质量因数约为100。