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Anti-counterfeiting pattern design method and application of dual-channel metasurface with watermark

A pattern design, super-surface technology, applied in the field of dual-channel super-surface anti-counterfeiting pattern design, to achieve the effect of improving security and good concealment

Inactive Publication Date: 2020-11-17
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional optical anti-counterfeiting technology based on interference and diffraction has been developed for decades, is well known by counterfeiters, and is easy to be copied

Method used

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  • Anti-counterfeiting pattern design method and application of dual-channel metasurface with watermark
  • Anti-counterfeiting pattern design method and application of dual-channel metasurface with watermark
  • Anti-counterfeiting pattern design method and application of dual-channel metasurface with watermark

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Embodiment Construction

[0040] The present invention will be further elaborated below in conjunction with specific drawings and specific embodiments.

[0041] The schematic diagram of the metasurface unit structure is shown in figure 1 shown. Depend on figure 1 It can be seen that the metasurface unit structure includes a substrate 2 and nano bricks 1 deposited on the substrate. The nano-brick 1 and the substrate 2 constitute a nano-brick unit structure. Wherein, the substrate is made of fused silica glass material, and the nano brick is made of silver material.

[0042] In order to make the function of the metasurface equivalent to a polarizer, the structural parameters of the nanobrick unit structure can be optimized so that the linearly polarized light with the polarization direction along the long axis of the nanobrick is reflected when it is incident, and the polarization direction is along the short axis of the nanobrick. Transmission occurs when linearly polarized light is incident.

[00...

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Abstract

The invention discloses a design method and application of a double-channel metasurface anti-counterfeiting pattern with a watermark. By skillfully constructing an emergent light intensity function, dual-channel metasurface image display can be realized, wherein one information channel records a continuous grayscale image, and the other information channel records a continuous grayscale image witha watermark; conversion between the two can be realized by rotating the polarization analyzer. The design method can be applied to the fields of high-end anti-counterfeiting, image display and the like.

Description

technical field [0001] The invention relates to the technical field of micro-nano optics and image display, in particular to a method for designing an anti-counterfeit pattern on a dual-channel metasurface with a watermark and its application. Background technique [0002] With the rapid development of the global economy, counterfeit and shoddy crimes have penetrated into all aspects of social and economic life, including clothing, currency, ID cards, credit cards, documents, etc. Among them, optical anti-counterfeiting is considered to have great potential in the anti-counterfeiting market because of its optical properties such as scattering, reflection, transmission, absorption, and diffraction, which can form visual effects with clear features, easy to describe, and remarkable effects that are easy to identify. Optically variable images can be divided into diffractive optically variable images and interference optically variable images according to the principle of light ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09F3/02G06T1/00G06Q30/00
CPCG06Q30/0185G06T1/0021G09F3/02G09F2003/0213
Inventor 郑国兴邓娟李子乐单欣李仲阳
Owner WUHAN UNIV
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