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Security-enhanced optical image authentication based on cascaded geometric-phase metasurfaces.

Yanfeng Su, Ruijie Xue, Zijing Li

    Applied Optics
    |September 22, 2025
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    Summary

    This study introduces a novel optical image authentication method using cascaded geometric-phase metasurfaces. The technique enhances security by creating physically separated ciphertext and key metasurfaces for robust user identity verification.

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    Area of Science:

    • Optics and Photonics
    • Information Security
    • Materials Science

    Background:

    • Metasurface-based optical image authentication methods often lack physical security keys.
    • Existing techniques face challenges in providing robust and physically secured authentication.

    Purpose of the Study:

    • To propose a security-enhanced optical image authentication method using cascaded geometric-phase metasurfaces.
    • To introduce a novel approach for user identity authentication that incorporates physical security keys.

    Main Methods:

    • Encoding a plaintext image into an authentication amplitude via sparse constraint encoding.
    • Calculating the Fourier phase-only hologram and decomposing it into ciphertext and key phases.
    • Constructing physically separated ciphertext and key metasurfaces using geometric-phase metasurface units.

    Main Results:

    • The proposed method successfully authenticates user identity through the cascading of ciphertext and key metasurfaces.
    • Numerical simulations demonstrate high feasibility and a strong security-enhanced effect.
    • The method offers a large key space, enhancing overall security.

    Conclusions:

    • The developed cascaded geometric-phase metasurface method provides a physically secure key for optical image authentication.
    • This approach overcomes limitations of current metasurface authentication systems.
    • The technique shows significant promise for advanced security applications.