Fig. 1. Schematic diagram of augmented reality display system based on waveguide coupling

Fig. 2. Schematic diagram of surface relief grating

Fig. 3. Schematic diagram of optical waveguide total reflection

Fig. 4. Schematic diagram of binary diffraction grating

Fig. 5. Relationship between refractive index of optical waveguide and maximum field of view angle

Fig. 6. Diagram of relationship between field of view, duty cycle, grating period and diffraction efficiency

Fig. 7. Diagram of relationship between field of view, grating thickness, grating angle and diffraction efficiency

Fig. 8. Diagram of relationship between field of view and diffraction efficiency of single-layer surface relief grating

Fig. 9. Simulation results of optimized parameters for double layer surface relief gratings

Fig. 10. Diagram of relationship between field of view and diffraction efficiency of double-layer surface relief grating

Fig. 11. Simulation results of optimized parameters for three layer surface relief gratings

Fig. 12. Diagram of relationship between inclination angle of the third layer grating and diffraction efficiency

Fig. 13. Relationship between field of view and diffraction efficiency of surface relief grating on different structures