Metasurface gratings, optical waveguides, and head-mounted devices

Abstract

The present invention provides a metasurface grating, an optical waveguide and a head-mounted device. Wherein, the metasurface grating is arranged on the side of the optical waveguide sheet close to the optical machine. The metasurface grating includes a first strip unit and a second strip unit with the same height and different widths, and the first and second strip units are separated by a first distance. The basic units constituting the metasurface grating are arranged in parallel, and the basic units are periodically arranged on the surface of the optical waveguide sheet at a second distance; when the height of the strip-shaped unit is greater than or equal to one third of the minimum wavelength of the light beam emitted by the optical machine, The light beam is incident on the metasurface grating, first deflects through the basic unit and produces a phase difference proportional to the height of the strip unit, enters the optical waveguide sheet and undergoes a second deflection and is totally reflected in the optical waveguide sheet, where the light beam is The coupling between two strips of different widths is negligible. The invention can realize color display through a single optical waveguide, effectively suppress multi-order diffraction, and obtain better imaging effect.

Description

technical field [0001] The invention relates to the technical field of metasurfaces, in particular to a metasurface grating, an optical waveguide and a head-mounted device. Background technique [0002] Augmented Reality (AR) and Virtual Reality (VR) devices are defined as the next generation of human and data interaction platforms after computers and mobile phones, people and people, people and machines, people and data. Communication has become more natural and efficient, and it has important application prospects in the fields of intelligent manufacturing, aerospace, medical health, education and teaching, financial services, public safety, culture and entertainment. The development of 5th Generation Mobile Communication Technology (5G), 6th Generation Mobile Communication Technology (6G), artificial intelligence, big data and other technologies has further promoted the development of AR and VR devices. develop. AR technology is a technical form that "seamlessly" superi...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a metasurface grating, an optical waveguide and a head-mounted device, which are used to solve the problems in the prior art that the optical waveguide is easily coupled into the grating to cause dispersion, ghosting, etc., and multi-level diffraction causes image leakage, binocular The vertigo problem caused by parallax can be displayed in color through a single optical waveguide, which improves the diffraction efficiency, effectively suppresses multi-level diffraction, and obtains better imaging effects, which can meet the needs of AR equipment

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