Bi-anisotropic Fano resonance in three-dimensional metamaterials
Bi-anisotropic Fano resonance in three-dimensional metamaterials
复制标题
三维超材料中的双各向异性 Fano 共振
DOI：
10.1038/s41598-018-27404-2
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发表时间：
2018
影响因子：
4.6
通讯作者：
Tanaka Takuo
中科院分区：
文献类型：
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作者：
Moritake Yuto;Tanaka Takuo
我们通过实验研究了三维 (3D) 超材料中法诺共振的双各向异性特性。 3D 超材料中的法诺共振源自同相和反相模式的干扰，这些模式源自具有失谐谐振波长的耦合 3D 开口环谐振器 (SRR) 中的模式混合。在法诺共振下，不仅介电常数和磁导率，而且双各向异性参数也显示出双色散响应。通过控制 3D-SRR 的反演对称性，证明了对 Fano 共振双各向异性响应的操纵。由于 3D-SRR 的旋转而改善了反演对称性，从而增强了法诺共振下的磁响应并抑制了电和双各向异性响应。由于反相模式的小辐射性质，在法诺共振下实现了可忽略不计的电和双各向异性响应。这种双各向异性Fano超材料具有丰富且可调的双各向异性，将扩展新光学现象的能力并拓宽双各向异性超材料的应用。
We experimentally investigated the bi-anisotropic properties of Fano resonance in three-dimensional (3D) metamaterials. Fano resonance in 3D metamaterials arises from the interference of in-phase and anti-phase modes that originate from mode hybridization in coupled 3D split ring resonators (SRRs) with detuned resonant wavelengths. At Fano resonance, not only permittivity and permeability but also the bi-anisotropic parameter show doubly dispersive response. Manipulation of the bi-anisotropic response at Fano resonance was demonstrated through controlling the inversion symmetry of the 3D-SRRs. Improvement of inversion symmetry due to rotation of 3D-SRRs results in enhancement of magnetic response and inhibition of electric and bi-anisotropy responses at Fano resonance. Negligible electric and bi-anisotropic responses at Fano resonance were achieved due to the small radiative nature of the anti-phase mode. This bi-anisotropic Fano metamaterials with rich and tunable bi-anisotropy will extend the capabilities of new optical phenomena and broaden the applications of bi-anisotropic metamaterials.