Wu Hong-Wei, Chen Hua-Jun, Xu Hua-Feng, Fan Ren-Hao, Li Yang
School of Mechanics and Photoelectric Physics, Anhui University of Science and Technology, Huainan, 232001, China.
National Laboratory of Solid State Microstructures and School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
Sci Rep. 2018 Jun 11;8(1):8817. doi: 10.1038/s41598-018-27268-6.
We demonstrate that directional electromagnetic scattering can be realized in an artificial Mie resonant structure that supports electric and magnetic dipole modes simultaneously. The directivity of the far-field radiation pattern can be switched by changing wavelength of the incident light as well as tailoring the geometric parameters of the structure. 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 is realized by exciting multiple electric and magnetic dipole modes with different frequencies in the quasiperiodic structure. The presented design concept is suitable for microwave to terahertz region and can be applied to various advanced optical devices, such as antenna, metamaterial and metasurface.
我们证明，在一种同时支持电偶极子模式和磁偶极子模式的人工米氏共振结构中，可以实现定向电磁散射。通过改变入射光的波长以及调整结构的几何参数，可以切换远场辐射方向图的方向性。此外，我们通过在狭缝中交替插入两种材料，进一步设计了一种准周期类米氏共振结构。结果表明，通过在准周期结构中激发不同频率的多个电偶极子模式和磁偶极子模式，实现了多波段定向光散射。所提出的设计概念适用于微波到太赫兹波段，可应用于各种先进光学器件，如天线、超材料和超表面。
