Fig. 1. Diagram of symmetrical interference of three light waves

Fig. 2. Three-wave interference grating model and simulation results

Fig. 3. H-PDLC formation principal diagram

Fig. 4. Schematic diagram of the liquid crystal cell

Fig. 5. Three-wave interference experimental optical path

Fig. 6. Two-dimensional grating membrane preparation flow

Fig. 7. Diffraction efficiency test light path

Fig. 8. Diffraction efficiency trend and grating topography at low power exposure

Fig. 9. Diffraction and optimization results of one-dimensional H-PDLC grating

Fig. 10. Grating morphology of different PDDA content

Fig. 11. Diffraction diagram and actual diagram of superimposed two-dimensional H-PDLC grating

Fig. 12. Method for measuring the diffraction angle of two-dimensional H-PDLC grating

Fig. 13. Diffraction angle measurement results of two-dimensional H-PDLC grating

Fig. 14. Two-dimensional H-PDLC grating film transmittance curve and film sample