Near-field dual-key encryption method based on metasurface

A key encryption and metasurface technology, applied in the field of information optics, can solve problems such as low security and complex optical encryption design methods, and achieve the effects of strong security, flexible dual-key encryption mode, and broad application prospects

Active Publication Date: 2021-03-26
WUHAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The present invention solves the problems of complex optical encryption design and low security in the prior art by providing a metasurface-based near-field double-key encryption method

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  • Near-field dual-key encryption method based on metasurface
  • Near-field dual-key encryption method based on metasurface
  • Near-field dual-key encryption method based on metasurface

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Embodiment Construction

[0042] In order to better understand the above-mentioned technical solution, the above-mentioned technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] As an emerging optical material, metasurfaces have attracted more and more attention due to their superior optical properties. The tiny periodic structure on the surface will change the equivalent refractive index of the surface of the object, thereby achieving fine manipulation of light wave parameters. Moreover, the metasurface processing technology is mature, the structure is simple, and it is easy to copy. It is an excellent choice for realizing the public key in the near-field double-key encryption technology.

[0044] This embodiment provides a metasurface-based near-field double-key encryption method, using the metasurface as a public key and using the phase distribution of incident light as a private key.

[0045] The metasurface i...

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Abstract

The invention belongs to the technical field of information optics, and discloses a near-field dual-key encryption method based on a metasurface, and the method comprises the steps: enabling the metasurface to serve as a public key, and enabling the phase distribution of incident light to serve as a private key; selecting the working wavelength of incident light, and optimizing the size parametersof the nano-brick, so that when the incident light under the working wavelength enters the nano-brick, the cross polarization conversion efficiency of the nano-brick is the highest, and the same-direction polarization conversion efficiency of the nano-brick is the lowest; calculating to obtain phase distribution information of the metasurface recording the public key image; determining directionangle arrangement information of a plurality of nano-bricks in the nano-brick array and arranging the nano-bricks on the substrate to complete the design of the public key; and calculating to obtain phase distribution information of incident light, and completing the design of the private key. The algorithm designed by the invention is simple, the degree of freedom of the design is higher, the security is extremely high, and the dual-key encryption mode is more flexible.

Description

technical field [0001] The invention relates to the field of information optics technology, in particular to a metasurface-based near-field double-key encryption method. Background technique [0002] As a new type of encryption, optical encryption technology has attracted more and more attention due to its unique technical characteristics, and has become one of the important research contents of modern encryption technology. However, most of the existing near-field encryption technologies are based on the polarization state of light, the amplitude, the increase in the number of information channels or the way of information transformation. The security of the system is low. [0003] For example, traditional near-field optical encryption technology mostly uses polarization multiplexing to encrypt and record, using different polarization states to form different information channels, so as to achieve the purpose of encryption. However, this encryption method is an ordinary s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/548H04B10/70H04L9/14H04N1/32
CPCH04B10/548H04B10/70H04L9/14H04N1/32272
Inventor 陈奎先郑国兴李子乐
Owner WUHAN UNIV
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