Design method of anti-counterfeiting metasurface based on anti-counterfeiting shading and image reuse

Abstract

The invention relates to the field of micro-nano optics and optical anti-counterfeiting technology, and discloses a design method of an anti-counterfeiting metasurface based on anti-counterfeiting shading and image multiplexing, including the following steps: constructing a nano-brick array, the nano-brick array includes a plurality of nano-brick structures Unit, optimize to obtain the optional size parameters of at least two groups of nano-brick structural units with functions equivalent to micro-nano polarizers and different spectral responses, and the nano-brick structures of each group of optional sizes are at wavelength λ 0 Response characteristics are the same; determine the continuous grayscale image, anti-counterfeiting shading image and two-color image that need to be multiplexed on the metasurface; arrange the size of the nanobrick unit structure and the nanobrick steering angle according to the multiplexed image to form a metasurface Material. The metasurface designed by the present invention can display grayscale images or anti-counterfeiting shading images under the incidence of linearly polarized light in different polarization directions, and display two-color images under white light illumination, which has the advantages of low algorithm complexity, high security and strong concealment, etc. advantage.

Description

technical field [0001] The invention relates to the field of micro-nano optics and optical anti-counterfeiting technology, in particular to a design method of an anti-counterfeiting metasurface based on anti-counterfeiting shading and image multiplexing. Background technique [0002] Anti-counterfeiting shading refers to the complete use of lines for anti-counterfeiting, which can produce rich changes and has the characteristics of anti-counterfeiting and anti-scanning. It is an anti-counterfeiting technology with low cost and good anti-counterfeiting effect. However, with the advancement of science and technology, anti-counterfeiting shading is used for anti-counterfeiting, and it is easy for criminals to destroy the anti-counterfeiting mark, or even tamper and forge the anti-counterfeiting mark. The security of anti-counterfeiting needs to be improved. A metasurface is an artificial layered material with a thickness smaller than a wavelength. Metasurfaces can realize the ...

AI Technical Summary

Problems solved by technology

However, the existing anti-counterfeiting methods for metasurfaces still need to be improved in terms of structural simplicity, design flexibility, information density, and anti-counterfeiting security.

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