Design and Fabrication Method of Phase Image Holography Based on Dielectric Metasurface

Abstract

The invention discloses a phase pattern hologram design and preparation method based on a dielectric metasurface. The phase pattern hologram based on a dielectric metasurface includes a substrate and a reflective nano-brick array; periodic arrangements are arranged on the substrate The nano-brick array unit, the diffraction distance is 0.1 ~ 1um; the number of nano-brick units in the dielectric nano-brick array is equal to the number of pixels of the target image, and the size of each nano-brick unit is the same, and the corners are different; the proposed dielectric metasurface based on the present invention Compared with the traditional holographic iterative design algorithm, its advantage lies in the simple design algorithm and strong implementability, and the designed and prepared image hologram has high efficiency and excellent imaging quality. For surface relief holograms, the present invention has the advantages of small size, light weight, and batch replication, and can be widely used in the fields of image display, information encryption, and the like.

Description

technical field [0001] The invention relates to the field of information optics technology, in particular to a phase-type image holographic design and preparation method based on a dielectric metasurface. Background technique [0002] Image holography technology has great practicability and application value in daily life because of its low requirements for light sources, that is, image holograms can be reproduced with white light source illumination. However, the traditional amplitude-type image holography uses a very small distance between the imaging beam and the recording dry plate, which has high requirements for recording conditions, has a complex structure, and is limited by the recording medium, so the efficiency cannot reach a particularly high level. In addition, recording The final hologram also has higher requirements for the preservation environment. Therefore, new technologies with high efficiency and higher robustness are urgently needed for holographic techn...

AI Technical Summary

Problems solved by technology

Due to the lack of phase information, the amplitude hologram has multiple diffraction orders, resulting in low diffraction efficiency

However, although the phase hologram has high efficiency, its preparation method is complicated, which is not convenient for mass production, and the materials used in the entire manufacturing process contain more toxic and harmful substances, such as potassium ferricyanide and mercury chloride, etc. environmental damage

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