Holographic element constructing method, encrypting/decrypting method, holographic element and device

Abstract

The invention discloses a holographic element constructing method, an encrypting / decrypting method, a holographic element and a device, wherein the holographic element constructing method, the encrypting / decrypting method, the holographic element and the device relate to the field of micro nano optical technology. The holographic element constructing method comprises the steps of using a mixed frequency information image which is obtained through superposing at least two characteristic images as a target image, wherein each characteristic image comprises high-frequency information which is obtained through performing high-pass filtering on different original images or low-frequency information that is obtained through performing low-pass filtering on the different original images; and according to the target image and the working wavelength of the selected polarized light, performing optimization designing of a geometric phase super-surface holographic element, and observing a characteristic image in a preset observation distance of the holographic reproduced image. According to the holographic element constructing method, the target image which comprises the high-frequency information and / or the low-frequency information is utilized, so that the characteristic pattern which comprises different frequency information can be obtained just through changing an observing distance, thereby supplying a new freedom for encryption of optical information.

Description

technical field [0001] The invention relates to the field of micro-nano optical technology, in particular to a construction method of a holographic element, an encryption and decryption method, a holographic element and a device. Background technique [0002] In recent years, due to their unique optical properties, metasurfaces have been successively applied in fields such as holography, lenses, and beam shaping. Since the polarization, amplitude, and phase characteristics of light waves can provide multiple degrees of freedom for optical information encryption technology, optical information encryption based on metasurface materials is considered to have strong development potential, but only using the polarization or wavelength characteristics of light waves is limited. The capacity of encrypted information. Contents of the invention [0003] In view of the defects existing in the prior art, the object of the present invention is to provide a construction method of a ho...

AI Technical Summary

Problems solved by technology

Since the polarization, amplitude, and phase characteristics of light waves can provide multiple degrees of freedom for optical information encryption technology, optical information encryption based on metasurface materials is considered to have strong development potential, but only using the polarization or wavelength characteristics of light waves is limited. capacity of encrypted information

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