Optical waveguide structure, AR device and manufacturing method of optical waveguide structure

Abstract

The invention relates to an optical waveguide structure, AR equipment and a manufacturing method of the optical waveguide structure. The optical waveguide structure comprises an optical waveguide body, wherein the optical waveguide body comprises a turning grating, a pupil expansion area and an emergent grating, and the turning grating is used for receiving light coupled into the optical waveguide body and coupling the light out of the pupil expansion area; the pupil expansion area is used for performing pupil expansion on the coupled light rays and coupling the light rays to the emergent grating; the emergent grating is used for coupling the coupled light out of the optical waveguide body; the turning grating, the pupil expanding area and the emergent grating are three-dimensional photonic crystals, and the three-dimensional photonic crystal of the turning grating, the three-dimensional photonic crystal of the pupil expanding area and the three-dimensional photonic crystal of the emergent grating are of different columnar structures. According to the optical waveguide structure, the three-dimensional photonic crystals are adopted as the turning grating, the pupil expanding area and the emergent grating, the crystal size of each grating and the distance between the crystals can be adjusted to meet diffraction angles required by different wavelengths, and the design of the grating module in the AR equipment is more flexible.

Description

technical field [0001] The present application relates to the technical field of AR devices, and in particular to an optical waveguide structure, an AR device and a method for manufacturing the optical waveguide structure. Background technique [0002] AR (Augment Reality, Augmented Reality) technology is a technology that ingeniously integrates virtual information with the real world. The optical display system of an AR device generally consists of various types of micro-displays and optical components. Among them, the optical waveguide is used as an optical component in AR devices because of its thinness and high penetration of external light. [0003] Optical waveguides can generally be classified into two types: Geometric Waveguide and Diffractive Waveguide. Among them, the diffractive optical waveguide mainly includes surface relief grating waveguide (Surface Relief Grating) manufactured by photolithography technology and holographic volume grating waveguide manufactu...

AI Technical Summary

Problems solved by technology

Such a grating structure can only have a high diffraction efficiency in a certain angle range, the angle selectivity is narrow, and the production process is complicated, which affects the production efficiency

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