Fig. 1. Schematic diagram of PVG basic structure

Fig. 2. Diffraction characteristics of reflected PVG

Fig. 3. Schematic diagram of PVG’s diffracted electric field distribution under Bragg condition

Fig. 4. Diffraction characteristics of PVG

Fig. 5. Schematic diagram of three-layer PVG structure

Fig. 6. Wavelength response curve of three-layer

Fig. 7. Angular response curve of three-layer PVG

Fig. 8. Relationship between the incidence angle of PVG single-layer color waveguide at different wavelengths and the diffraction angle of the waveguide（n=1.9）

Fig. 9. Preparation process of PVG

Fig. 10. Holographic exposure light path

Fig. 11. Device diagram prepared in this study

Fig. 12. Band response curve of three-layer PVG under normal incidence

Fig. 13. Optical path diagram of test sample

Fig. 14. Diffraction efficiency of three-layer PVG at different incidence angles

Fig. 15. Diagram of beam coupling process

Fig. 16. Experimental effect of coupling of circularly polarized light in waveguide plate

Fig. 17. Wavelength response curve of optimized three-layer PVG

Fig. 18. Angle response curve of the optimized three-layer PVG