Liquid crystal polymer polarizing gratings have been widely studied in augmented reality optical waveguide displays due to their nearly 100% diffraction efficiency, large angular bandwidth, and wavelength bandwidth. The thickness of each area of the grating film layer prepared by the existing film production method (spin coating) is the same, which is unfavorable for uniform imaging of large-format liquid crystal polymer polarized grating optical waveguides. This paper proposes a method of etching and thinning the grating film layer to achieve specific efficiency modulation. The experimental values and simulated values are in good agreement, providing a reference for segmented control of the efficiency of large-format liquid crystal polymer polarization gratings.
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