Abstract
We propose an all-dielectric metasurface for simultaneously controlling phase and amplitude at the subwavelength scale. Based on the Pancharatnam–Berry phase and Fabry–Pérot resonance, the variations of phase and amplitude can cover 0–2π and 0–1, respectively. Moreover, the polarization conversion efficiency and polarization conversion purity can reach up to 88 and 94%, respectively. By this method, a vortex beam generator with controllable topological charges and amplitudes is successfully designed. The proposed metasurface provides an effective method for the complete control of phase and amplitude, which can be used for holography, beam shaping, and the synthesis of complex wave fields.
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