Fig. 1. Unit structure of metalens

Fig. 2. (a) Structure parameters and phases and (b) structure parameters and transmittance when linearly polarized light is incident

Fig. 3. (a) Structure parameters and phases and (b) structure parameters and transmittance when circularly polarized light is incident

Fig. 4. Phase and transmittance of each structure in a single-row structure with period of 200 nm

Fig. 5. Focusing effect of single-row structure with period of 200 nm. (a) One-dimensional longitudinal field strength; (b) full width at half maximum (FWHM); (c) energy distribution

Fig. 6. Phase and transmittance of each structure under single-row structure with different periods. (a) Period is 250 nm; (b) period is 300 nm

Fig. 7. Focusing effect of single-row structure with period of 250 nm. (a) One-dimensional longitudinal field strength; (b) FWHM; (c) energy distribution

Fig. 8. Focusing effect of single-row structure with period of 300 nm. (a) One-dimensional longitudinal field strength; (b) FWHM; (c) energy distribution

Fig. 9. Phase and transmittance of each structure in single-row structure with period of 200 nm

Fig. 10. Focusing effect of single-row structure with period of 200 nm. (a) One-dimensional longitudinal field strength; (b) FWHM; (c) energy distribution