Fig. 1. Diagram of focusing an off-axis meta-lens

Fig. 2. Design flowchart of off-axis mate-lens

Fig. 3. Phase distribution corresponding to unit structure with different radii

Fig. 4. (a) Schematic diagram of unit structure simulation and (b) simulated structure diagram of off-axis mate-lens

Fig. 5. Simulation results of off-axis mate-lens by Lumerical

Fig. 6. Phase distributions and simulation results for D=30 μm, α=13°, λ₀=1.550 μm, f=32.986 μm

Fig. 7. Phase distribution and simulation results for D=30 μm, α=13°, λ₀=1.550 μm, f=80 μm

Fig. 8. Schematic diagram of 示意图

Fig. 9. Phase distributions of off-axis meta-lens with different α

Fig. 10. The intensity distributions of the off-axis meta-lens along Z axis with different incident wavelengths when α=13°

Fig. 11. Intensity distribution of the off-axis meta-lens along Z axis with different incident wavelengths when α=20°

Fig. 12. Curve of focusing efficiency corresponding to different off axis angles at NA=0.408