Diffraction optical waveguide and design method thereof

The invention discloses a diffractive optical waveguide and a design method thereof, and the design method comprises the steps: calculating the effective size of a second grating region according to a user view parameter; in the K-domain graph, obtaining a coupling-in view plane coordinate after the incident light is coupled into the waveguide substrate through the first grating area; in a plane where the first grating area is located, taking the center of the first grating area as an original point, and establishing a first effective diffraction area for diffraction transmission of the incident light in the waveguide substrate according to the coupled view plane coordinates and the effective diameter of the first grating area; and determining the effective position of the second grating area according to the effective sizes of the first effective diffraction area and the second grating area. Visual analysis is conducted on the K-domain diagram of the diffraction optical waveguide, the layout mode and the des