Optical encryption structure, optical encryption method and device

CN115524874BActive Publication Date: 2024-12-31SHENZHEN METALENX TECH CO LTD
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Patent Information

Application Number
CN202211261379.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-10-14
Publication Date
2024-12-31
Estimated Expiration
2042-10-14

AI Technical Summary

Technical Problem

During the decryption process, existing optical encryption technologies are affected by optical properties such as focal length, diffraction distance and phase, making it difficult to achieve high security and flexible key management.

Method used

Optical encrypted metasurface is constructed using wavelength-sensitive target nanostructures, and optical encryption is achieved by modulating wavelength and polarization states. The original pattern can be restored only under the irradiation of beams of specific wavelength and polarization states, enhancing the security and flexibility of decryption. .

Benefits of technology

It realizes high security and flexibility of optical encryption, and can only decrypt it when the decryption wavelength and polarization state are known, avoiding illegal cracking. At the same time, due to the thin and thin characteristics of the nanostructure, it occupies a small size and can encrypt a large amount of information.

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Abstract

The present invention provides an optical encryption structure, an optical encryption method and an optical encryption device, wherein the structure includes: an optical encryption metasurface; the optical encryption metasurface includes a plurality of periodically arranged target nanostructures, the target nanostructures are sensitive to wavelength; the phase distribution of the optical encryption metasurface to a light beam of a first characteristic is a preset first target phase distribution; the first characteristic includes a first decryption wavelength, and the first target phase distribution is a phase distribution converted based on the light intensity distribution of a first target pattern to be encrypted. Through the optical encryption structure, optical encryption method and device provided by the embodiments of the present invention, an optical encryption metasurface is constructed using a target nanostructure that is sensitive to wavelength, and only by irradiating the optical encryption metasurface with a light beam having the first characteristic can the original first target pattern be restored. The optical encryption metasurface is light and thin, and can encrypt and record a large amount of information using only a small amount of material and occupying a very small volume.
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