Double-sided grating waveguide, preparation method thereof and positioning device

Abstract

The invention discloses a preparation method of a double-sided grating waveguide. The preparation method comprises the following steps: preparing and forming a first grating layer on a first surface of a first sub-waveguide; preparing and forming a second grating layer on the first surface of the second sub-waveguide; and attaching and connecting the second surface of the first sub-waveguide and the second surface of the second sub-waveguide to obtain the double-sided grating waveguide of which the two opposite surfaces are provided with grating layers. When the double-sided grating waveguide is formed, the two sub-waveguides are adopted to replace a complete single waveguide structure in the conventional technology, the grating layers are formed on the two sub-waveguides respectively, then the two sub-waveguides are connected with each other to form a complete waveguide structure, and the two grating layers are independently formed on the two separated sub-waveguides respectively. And the quality and the working performance of the whole double-sided grating waveguide are ensured. The invention further provides a double-sided grating waveguide and a positioning device for preparing the double-sided grating waveguide, and the double-sided grating waveguide and the positioning device have the above beneficial effects.

Description

technical field [0001] The invention relates to the field of optical waveguide technology, in particular to a method for preparing a double-sided grating waveguide, a double-sided grating waveguide and a positioning device for preparing the double-sided grating waveguide. Background technique [0002] Augmented reality (AR) technology is a technology that combines virtual images and real images. Augmented reality glasses have become a research hotspot among head-mounted augmented reality devices in recent years because of their good portability. [0003] Grating waveguides are one of the key components in augmented reality display devices. In the grating optical waveguide solution, the efficiency of light energy being coupled into and out of the waveguide has a very important impact on the overall efficiency of light energy usage. In order to improve the incoupling and outcoupling efficiency of light, on the one hand, the diffraction efficiency of the grating can be increa...

AI Technical Summary

Problems solved by technology

However, the current method of preparing optical waveguide structures often causes the gratings on the two surfaces to interact with each other, making it impossible to prepare double-sided grating waveguides with good performance.

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