3D conductive coupling for efficient generation of prominent Fano resonances in metamaterials.
3D conductive coupling for efficient generation of prominent Fano resonances in metamaterials.
复制标题
3D 传导耦合可在超材料中有效生成显着的 Fano 共振。
DOI：
10.1038/srep27817
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发表时间：
2016-06-14
影响因子：
4.6
通讯作者：
Li ZY
中科院分区：
文献类型：
--
作者：
Liu Z;Liu Z;Li J;Li W;Li J;Gu C;Li ZY
我们展示了一种三维导电耦合机制，用于在三维超材料中有效地产生突出的和鲁棒的Fano共振，该超材料是通过将垂直U形开口环谐振器（SRR）或垂直矩形板沿着具有非凡光传输（EOT）的平面金属孔阵列集成而形成的。在这样的配置中，沿金属孔沿着感应增强的垂直E场，并且自然地激发垂直结构的电共振，这形成非辐射“暗”模式。这些3D导电“暗”模式强烈地干扰EOT结构的“亮”共振模式，产生显著的Fano共振，具有显著的相消和相长干扰。所展示的3D导电耦合机制是高度通用的，因为具有垂直SRR和垂直板的3D MEMS都表现出相同的突出Fano谐振，尽管它们具有显著的结构差异，这在概念上不同于传统的电容和电感耦合机制，其在小的结构偏差时急剧退化。
We demonstrate a 3D conductive coupling mechanism for the efficient generation of prominent and robust Fano resonances in 3D metamaterials (MMs) formed by integrating vertical U-shape split-ring resonators (SRRs) or vertical rectangular plates along a planar metallic hole array with extraordinary optical transmission (EOT). In such a configuration, intensified vertical E-field is induced along the metallic holes and naturally excites the electric resonances of the vertical structures, which form non-radiative “dark” modes. These 3D conductive “dark” modes strongly interfere with the “bright” resonance mode of the EOT structure, generating significant Fano resonances with both prominent destructive and constructive interferences. The demonstrated 3D conductive coupling mechanism is highly universal in that both 3D MMs with vertical SRRs and vertical plates exhibit the same prominent Fano resonances despite their dramatic structural difference, which is conceptually different from conventional capacitive and inductive coupling mechanisms that degraded drastically upon small structural deviations.