Laser & Optoelectronics Progress, Vol. 56, Issue 20, 202408 (2019)
Geometric-Phase Metasurfaces: from Physics to Applications
Hu Zhong1, Xu Tao1, Tang Rong1, Guo Huijie2, and Xiao Shiyi1,*
- 1Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200444, China
- 2State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China
According to the generation mechanism of electromagnetic (EM) phase, electromagnetic metasurfaces can be divided into resonance-based metasurfaces using resonance response of microstructures and geometric-phase metasurfaces using anisotropic response of microstructures. In comparison with the resonance-based metasurfaces, geometric-phase metasurfaces have attracted much attention in recent years because of their non-dispersion, polarization dependence, and easy fabrication. This study presents an overview of the development of geometric-phase metasurfaces from the principle and method of their free modulation of EM waves to their extraordinary wavefront manipulation abilities in both the far- and near-field regions. Finally, we also present three typical applications enabled by geometric-phase metasurfaces, including highly efficient meta-hologram, vortex beam generator/detector, and flat achromatic metalens.
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