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Concealed holographic coding for security applications by using a moiré technique.

X Zhang, E Dalsgaard, S Liu

    Applied Optics
    |February 12, 2008
    PubMed
    Summary
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    We developed a novel optical coding method using the moiré phenomenon to significantly improve hologram security. This technique embeds invisible phase patterns, making holograms extremely difficult to counterfeit.

    Area of Science:

    • Optics
    • Materials Science
    • Security Technology

    Background:

    • Security holograms are widely used but vulnerable to counterfeiting.
    • Existing anticounterfeiting measures can be circumvented.

    Purpose of the Study:

    • To present a new optical coding technique for enhanced hologram anticounterfeiting.
    • To leverage the moiré phenomenon for robust security features.

    Main Methods:

    • Developed an optical coding technique based on the moiré phenomenon.
    • Incorporated an invisible phase pattern into the hologram code.
    • Utilized holographic, photographic, and embossing methods for fabrication.

    Main Results:

    • The optical coding technique enhances the anticounterfeiting capabilities of security holograms.

    Related Experiment Videos

  • The embedded phase pattern is invisible and undetectable by standard optical equipment.
  • Fabricated coded holograms and decoders using advanced techniques.

    • Conclusions:

    • The moiré-based optical coding offers a powerful and difficult-to-imitate solution for hologram security.
    • This technique significantly raises the barrier against hologram counterfeiting.