A Dynamic Holographic Method Based on Geometric Metasurface
A metasurface, geometric technology, applied in the field of optical components, systems and instruments, can solve the problems of inability to achieve rapid refresh and large-area display integration, inability to integrate images on a large scale, and difficult to quickly refresh, etc., to solve the problem of low diffraction efficiency and good Development and application potential, reproduction of clear image quality
Active Publication Date: 2018-03-13
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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[0004] In view of this, the purpose of the present invention is to provide a new method of dynamic holography based on geometric metasurfaces, which has high diffraction efficiency and can reproduce images The quality is clear, which solves the shortcomings of low diffraction efficiency caused by zero-order light in traditional dynamic holography, and cannot achieve fast refresh and large-area display integration. It has good development and application potential
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[0028] The present invention provides a new method of dynamic holography based on geometric metasurface, its implementation process is as follows:
[0029] (1) The embodiment consists of a computer program control part, an integrated circuit part with specific functions, a micro-rotation system, a geometric metasurface part, a light source part and a receiving screen, such as figure 1 .
[0030] (2) The light emitted by a light source with a wavelength of 700nm passes through a polarizer and a quarter-wave plate in turn to become right-handed circularly polarized light, and is perpendicularly incident on the metasurface. The outgoing left-handed circularly polarized light is modulated by the metasurface and finally projected on the receiver screen to form the holographic image we need. The computer control program selectively gives input pulses through the integrated circuit to make the micro-rotation system rotate, such as figure 2 .
[0031] (3) The receiving screen is a...
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The invention relates to a dynamic holographic method based on a geometric metasurface, and belongs to the technical field of optical elements, systems and instruments. In this method, the light emitted by the light source passes through the polarizer, the quarter-wave plate, the geometric metasurface, and finally reaches the receiving screen. The size of the receiving screen is determined by the geometric metasurface and the observation distance; the geometric metasurface structure is passed through MIM Mode to realize wavefront phase modulation; use micro-rotation system and integrated circuit to control specific rotation angle of geometric metasurface to realize real-time regulation of wavefront. The method of the present invention has high diffraction efficiency and clear reproduction image quality, solves the shortcomings of low diffraction efficiency caused by zero-order light in traditional dynamic holography, and cannot realize fast refresh and large-area display integration, and has good development and application potential.
Description
technical field [0001] The invention belongs to the technical field of optical components, systems and instruments, and relates to a dynamic holographic method based on a geometric metasurface. Background technique [0002] Holography, since its birth, has attracted much attention for its completeness of recorded information. It can record three-dimensional information of real objects well, and restore the original three-dimensional appearance of objects under the action of reproduced light. Holography has attractive application prospects and has great potential in realizing dynamic three-dimensional display. Traditional dynamic holography is mainly divided into two categories, namely, dynamic holography based on spatial light modulator diffraction and dynamic holography based on special materials. Among them, the method based on the spatial light modulator is limited by the spatial light modulator itself, cannot realize large-scale holographic display, and has problems suc...
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IPC IPC(8): G03H1/14
Inventor 尹韶云郑倩颖刘丹骏杨正蔡文涛孙秀辉杜春雷
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI