Ultrathin Dual-Band Wide-Angle Beam Scanning Metalens Based on High-Efficiency Meta-Atom

Metasurfaces composed of planar subwavelength-scaled meta-atoms demonstrate unprecedented wavefront manipulation capabilities. However, the wavelength-dependent property of the metasurface could severely reduce the design freedom, and most metasurfaces require multilayer structure for high efficiency. Herein, a single-layered-substrate meta-atom is proposed to achieve independent phase manipulations as well as high transmission efficiencies at two frequencies. Specifically, the full 2 pi phase coverages can be individually realized through rotating the corresponding resonators. As a proof-of-concept demonstration, a dual-band high-efficiency metalens with wide field-of-view (FoV) under the circular polarization incidence is simulated, fabricated and measured at kappa a-band for satellite communications. Both simulation and experimental results agree well with each other, demonstrating that wide scanning coverages of +/- 60 degrees can be achieved at both 20 and 30 GHz. The proposed method can be a competitive candidate for designing dual-band high-efficiency meta-devices.

Automated summary

This study proposes a method using single-layered-substrate meta-atoms to achieve independent phase manipulation and high transmission efficiency at two frequencies. By rotating the corresponding resonators, the full 2π phase coverage can be achieved. Simulation and experimental results demonstrate wide scanning coverages at both 20 and 30 GHz.