Information encryption method based on circuitous phase and resonant phase hybrid metasurface

Abstract

The invention provides an information encryption method based on a roundabout phase and resonance phase hybrid metasurface, which comprises the following steps of: 1, selecting a target image, and acquiring phase distribution of the target image; 2, designing a super-structure surface unit structure; 3, constructing a resonance phase gradient, and screening a unit structure group at the working wavelength lambda1; 4, screening unit structures only having-1-order diffraction at the working wavelength lambda2 in the unit structure group obtained in the step 3; 5, optimizing the distance between adjacent units, and constructing a circuitous phase; step 6, holographic design of the superstructure surface; and step 7, electromagnetic waves are incident to the surface of the metasurface at different incident wavelengths, polarizations and incident angles, different target images are obtained in different emergent directions, and encryption of optical information is realized. According to the invention, the resonance phase and the circuitous phase are respectively introduced under different wavelengths, polarization and incident angles, so that the security of the optical information encryption technology based on the metasurface is improved.

Description

technical field [0001] The invention relates to the field of micro-nano optics technology, in particular to an information encryption method based on a detour phase and a resonance phase hybrid metasurface. Background technique [0002] A metasurface is a two-dimensional artificial composite structure composed of subwavelength unit structures. By interacting with electromagnetic waves, it can flexibly and effectively control multiple optical parameters of electromagnetic waves, such as amplitude, polarization, phase, and wavelength. Based on multi-dimensional light field regulation, metasurfaces provide a brand new platform for optical information encryption, hiding, encoding and other technologies. [0003] Compared with the traditional optical information encryption technology, the optical information encryption technology based on the metasurface holographic image has the characteristics of high pixel, flexible design, easy integration, and precise control. In the optica...

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Problems solved by technology

[0004] Aiming at the technical problem of low security of optical information encryption key based on metasurface holographic technology, the present invention proposes an information encryption method based on detour phase and resonance phase hybrid metasurface, by introducing resonance phase and resonance phase under different incident conditions Detour phase, designing a multi-dimensional key including incident angle, polarization, wavelength, and outgoing angle, improving the security of optical information encryption technology based on metasurface holographic images

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