欺骗Mie谐振结构的可调谐多频带定向电磁散射
Tunable multiband directional electromagnetic scattering from spoof Mie resonant structure
摘要：
我们证明了可以从同时支持电和磁偶极子模式的人工Mie共振结构中实现定向电磁散射。通过改变入射光的波长以及调整结构的几何参数，可以改变远场辐射方向图的方向性。特别地，在较高频率下的电四极子显著地贡献于散射场，导致方向性的增强。此外，我们进一步设计了一种准周期性的欺骗米氏共振结构，通过交替插入两种材料到狭缝中。结果表明，通过在准周期结构中激发多个不同频率的电、磁偶极子模，实现了多波段定向光散射。所提出的设计概念是通用的从微波到太赫兹区域，并可以应用于各种先进的光学器件，如天线，超材料和metsurface。
英文摘要：
We demonstrate that directional electromagnetic scattering can be realized from a artificial Mie resonant strcuture which supports electric and magnetic dipole modes simultaneously. The directivity of the far-field radiation pattern can be switched by changing the incident light wavelength as well as tailoring the geometric parameters of the structure. Particularly, the electric quadrupole at higher frequency contribute significantly to the scattered fields, leading to enhancement of the directionality. In addition, we further design a quasiperiodic spoof Mie resonant structure by alternately inserting two materials into the slits. The results show that multi-band directional light scattering are realized by exciting multiple electric and magnetic dipole modes with different frequencies in the quasiperiodic structure. The presented design concept is general from microwave to terahertz region and can be applied for various advanced optical devices, such as antenna, metamaterial and metsurface.
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