Large-depth metasurface polarization holographic 3d display method

A large-depth metasurface polarization holographic 3D display method, comprising:

• for two different 3D objects, that is, a first 3D object and a second 3D object, performing calculations based on an angular spectrum diffraction theory to obtain a first metasurface hologram and a second metasurface hologram of the two 3D objects respectively, and performing left-handed circularly polarized light holographic reconstruction and right-handed circularly polarized light holographic reconstruction by using the first metasurface hologram and the second metasurface hologram, respectively;
• performing interleaved row-by-row insertion of the first and the second metasurface holograms to encode into a synthetic hologram, optimizing phases of the synthetic hologram by using an error diffusion algorithm to obtain phase information required by metasurface structures, that is, meta-phase information;
• designing the metasurface structures based on the meta-phase information, and making a metasurface structure in odd rows sensitive to left-handed circularly polarized light, and a metasurface structure in even rows sensitive to right-handed circularly polarized light;
• and
• performing holographic 3D reconstruction by illuminating the metasurface structures with laser;
• when the metasurface structures are illuminated by the left-handed circularly polarized light, the metasurface structure only in the odd rows is sensitive to incident light, such that a phase of light field can be modulated, in which case, a large-depth holographic reconstruction image of the first 3D object can be seen;
• when the metasurface structures are illuminated by the right-handed circularly polarized light, the metasurface structure only in the even rows is sensitive to incident light such that the phase of light field can be modulated, in which case, a large-depth holographic reconstruction image of the second 3D object can be seen;
• and when the metasurface structures are illuminated by the left-handed circularly polarized light and the right-handed circularly polarized light simultaneously, the large-depth holographic reconstruction images of the first 3D object and the second 3D object can be seen at the same time.