Simulating a computer-generated waveguide hologram scattering problem with an artificial 2D Gaussian beam source

We study a computer-generated waveguide hologram scattering problem. An artificial current density function with Gaussian profile is defined on a source plane that is close to the scatterers. A Gaussian beam field is induced based on the artificial current density function, and can be controlled to approximate the original incident field. The computer-generated waveguide hologram scattering problem is then solved with a spatial spectral method.