The super-surface focusing lens calculates the deflection phase. What should we do next?

First of all, you should construct a scatterer with cross polarization of 0 and mirror symmetry. Then * * * polarization amplitude is the same, and the phase difference is 180. This phase difference can be achieved by the combination of dielectric constant and thickness of scatterers and substrates with different sizes. For larger transmissions, complementary structures are usually used. In this way, if you use left-handed circular polarization, and then you rotate the angle of the scatterer, you can get a right-handed polarization through transmission, and introduce a phase called geometric phase. Left-handed incidence and right-handed incidence correspond to different geometric phases of transmitted electromagnetic waves, which is related to spin Hall effect. Secondly, you should design the focusing plane, that is, let the left-handed wave or right-handed wave pass through the hypersurface to produce the phase, and compensate the phase of the optical path, so that different optical paths experience the same phase from the focusing point. This phase compensation can be achieved by rotating the scatterer at different angles.