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Structural-color nanoprinting with hidden watermarks.

Zile Li, Qi Dai, Liangui Deng

    Optics Letters
    |February 2, 2021
    PubMed
    Summary

    Researchers developed a novel structural-color nanoprint using nanostructured metasurfaces. This technology allows for hidden watermarks to be revealed using polarized light, enabling advanced anticounterfeiting and data storage solutions.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Nanostructured metasurfaces offer advanced control over light's spectral and polarization properties at the nanoscale.
    • Integrating color nanoprinting with polarization-dependent optical components presents new opportunities for information display and security.

    Purpose of the Study:

    • To design and demonstrate a structural-color nanoprint with hidden watermarks.
    • To leverage polarization-assisted spectrum manipulation for dynamic image display.
    • To explore applications in anticounterfeiting, encryption, and optical data storage.

    Main Methods:

    • Fabrication of nanostructured metasurfaces capable of manipulating light polarization and spectrum.
    • Experimental demonstration using unpolarized and linearly polarized white light.

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  • Characterization of the metasurface's optical response under different polarization states.

    • Main Results:

    • A structural-color nanoprint was successfully created, with hidden watermarks concealed under unpolarized light.
    • Upon illumination with linearly polarized light, the hidden watermarks became visible, overlaying the original nanoprint.
    • The metasurface demonstrated a flexible switching capability between watermark-hidden and watermark-revealed modes.

    Conclusions:

    • The proposed metasurface provides a novel platform for creating dynamic color nanoprinting-images with embedded, switchable watermarks.
    • This technology offers a versatile and easily camouflaged scheme for anticounterfeiting and secure information display.
    • Potential applications include encryption, information multiplexing, and high-density optical storage solutions.