Fig. 1. (a) Performing diagram of x-LP beam generator. (b) Schematic diagram of RCP beam generation under non-polarized incidence.

Fig. 2. (a) Schematic diagram of the linear polarizer. (b) Simulated results on the xz plane under x-LP incidence. (c) The intensity distributions of the transmitted x-LP and y-LP components on the xz plane under y-LP illumination. (d) The intensity profiles of the orthogonal LP components of the outgoing wave at the focal plane, under different polarized incidences.

Fig. 3. (a) SEM image of the sample. (b) The measured intensity profiles of x-LP and y-LP components on the focal plane, under the incidences of four polarized waves.

Fig. 4. (a) Schematic of the Meta-atom 1. (b) Top view of the Meta-atom 2. (c) Transmission amplitudes of cross- and co-polarized components at different frequencies, under LCP incidence. (d) Simulated results of phase shifts under LCP incidence. (e) The relationship between the transmission amplitudes of the orthogonal CP components and the incident frequency, when the RCP wave is incident. (f) The phase shift of the transmitted LCP wave at different incident frequencies under RCP incidence.

Fig. 5. (a) Schematic diagram of the structure of the metasurface zone plate. (b, c) The intensity distributions of the cross- and co-polarized components at the focal plane under CP incidences. (d) The simulated intensity distribution of the focal plane under LP and EP incidences.

Fig. 6. (a) SEM image of the fabricated metasurface zone plate. (b) The measured intensity profiles of the focal plane under CP and LP incidences. The inset is the intensity distribution across the focus along the x-axis.