Optical encryption method based on metasurface holographic technology

A technology of holographic technology and encryption method, applied in the field of micro-nano optics and information encryption, to achieve the unique effect of interpreting rules

Active Publication Date: 2021-05-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are many optical encryption methods, based on fractional Fourier transform or double random phase encoding. Improve the computer encryption algorithm to achieve a more secure encryption method, but there are still innovations in this direction

Method used

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  • Optical encryption method based on metasurface holographic technology
  • Optical encryption method based on metasurface holographic technology
  • Optical encryption method based on metasurface holographic technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The overall flow chart of the optical encryption method based on metasurface holographic technology in the present invention is as follows figure 1 shown;

[0070] Step 1: The information sender uses the three-image association algorithm to generate holographic phase images A, B, and C;

[0071] The information sender first uses the traditional GS binary phase holographic algorithm to calculate the original images of three target holograms and five binary phase holograms corresponding to two blank images without information. The five phase holograms contain only two phase holograms. phase value and and Satisfied that the phase difference is about π Then bring the generated five images into the three-image association algorithm, optimize the mixing ratio involved in the neutralization operation of the algorithm, and obtain the holographic phase images A, B, and C. The flow chart of the three-image association computer holographic algorithm is as follows figure...

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Abstract

The invention relates to an optical encryption method based on a metasurface holographic technology, and belongs to the field of micro-nano optics and information encryption. A micro holographic display integrating the liquid crystal and the metasurface is formed by combining the liquid crystal and an improved spatial light modulator, regional electric control can be achieved on a two-dimensional plane, and the micro holographic display is light, thin and small. A three-graph association algorithm can generate three binary phase holograms having an inclusion relation in mathematics, and the three holograms are in one-to-one correspondence with three voltage distribution graphs. The three voltage distribution graphs are loaded on the micro holographic display integrating the liquid crystal and the metasurface in sequence, and three basic graphs for subsequent decoding can be reproduced in a far field. And furthermore, plaintext information can be restored by referring to a ciphertext and a ciphertext query table. The optical encryption method has certain security, can cover various types of plaintext contents, and can be used for information encryption and secure transmission processes of specific occasions and specific objects.

Description

technical field [0001] The invention relates to an optical encryption method based on metasurface holographic technology, which has better uniqueness and security. The micro-holographic display integrated with liquid crystal and metasurface covers a wide range of encrypted information and can be applied in specific occasions In the safe transmission of information or information encryption, it belongs to the field of micro-nano optics and information encryption. Background technique [0002] Metasurfaces are two-dimensional arrays of subwavelength-sized metallic or dielectric nanoantennas. By optimizing the design of the nanoantenna array, each pixel unit on the metasurface can introduce a phase mutation at the interface between the two media, so that the incident electromagnetic wave is imposed with an arbitrary phase distribution. Based on this, researchers have used metasurfaces to achieve many meaningful theoretical and experimental studies such as anomalous refraction,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/00G03H1/04G03H1/08
CPCG03H1/0011G03H1/0443G03H1/0808G03H1/0866G03H2001/0022
Inventor 黄玲玲祝双琦王涌天李晓炜
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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