Fig. 1. Schematic diagram of broadband high-efficiency polymerized liquid crystal metasurfaces. The first row indicates that the designed BHPLCM1 can enable polarization-switching functions from diffraction-limited focusing to sub-diffraction focusing, and the second row indicates that the designed BHPLCM2 can achieve the polarization-switching behavior from diffraction-limited focusing to focusing vortex beam.

Fig. 2. Fabrication and characterization of proposed BHPLCMs. (a) Schematic diagram of the fabrication procedure of BHPLCMs. (b) POM images of BHPLCM1 (top row) and BHPLCM2 (bottom row). The blue arrow and red arrow denote the input and output polarization states of light.

Fig. 3. Schematic of the experimental setup. The dashed box, physical map of the BHPLCM1; scale bar, 1 mm.

Fig. 4. Simulated and experimental light distributions at the focal plane for BHPLCM1 under the incident light with different polarizations and wavelengths. The width and length of the figures in simulated and experimental results are all fixed as 600 μm.

Fig. 5. Simulated and experimental light distributions along the propagation direction for BHPLCM1. Note that the measured propagation region is different under different incident wavelengths.

Fig. 6. Simulated and experimental light distributions at the focal plane for BHPLCM2 under the incident light with different polarizations and wavelengths. The width and length of the figures in simulated and experimental results are all fixed as 600 μm.

Fig. 7. Simulated and experimental light distributions along the propagation direction for BHPLCM2. Note that the measured propagation region is different under different incident wavelengths.

Fig. 8. Calculated FWHM, PCR, and focusing efficiency of simulated and experimental results for BHPLCM1.

Fig. 9. Optical performance under different discrete precision.

Fig. 10. Influence of inhomogeneity of the incident light.

Fig. 11. Influence of the fabrication errors.

Fig. 12. Contrast between the super-oscillatory spots with different super-resolution capabilities.

Fig. 13. Optical performance of the BHPLCM3 with different sub-diffraction focal spots under LCP/RCP incidence.