Design method of high and low frequency multiplexing metasurface anti-counterfeiting image with watermark

Abstract

The invention discloses a method for designing anti-counterfeiting images with high and low frequency multiplexed supersurfaces with watermarks, relates to the field of micro-nano optics technology, constructs a nano-brick array including a plurality of nano-brick structural units, and cleverly designs the nano-brick array The distribution of the steering angle of the nanobricks, when the linearly polarized light is incident on the metasurface, its light intensity and polarization direction are modulated and then emitted as reflected light, and the reflected light displays a high-resolution image in the near field through the analyzer. The hybrid image can extract different image information under different cut-off frequencies, and then design a watermark image and adjust the steering angle of the nano-bricks in the nano-brick array; when the polarizer is rotated to another At a specific angle, the mixed image will be superimposed with a watermark image, which does not affect the display of the original mixed image. The invention provides a new image anti-counterfeiting method, which can be applied to the anti-counterfeiting technology of high-end products due to its high difficulty in imitation and high security.

Description

technical field [0001] The invention relates to the technical field of micro-nano optics, in particular to a design method of a watermarked high-low frequency multiplexed metasurface anti-counterfeiting image. Background technique [0002] In recent years, due to the temptation of high profits, many unscrupulous traders have worked hard in manufacturing and selling fraudulent goods, and their potential hazards and risks are always threatening consumers and brand manufacturers. Conventional anti-counterfeiting methods, such as holograms, etc., have not been effective in anti-counterfeiting due to the promotion of counterfeiting technical means and have become easy to copy. In order to protect the corporate brand, protect the market, and protect the legitimate rights and interests of consumers, researchers continue to improve and update anti-counterfeiting technology. Recently, anti-counterfeiting technology based on metasurfaces has been continuously proposed. Due to its sma...

AI Technical Summary

Problems solved by technology

However, the current 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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