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Fabrication of diffraction based security elements using direct laser interference patterning.

Florian Rößler, Tim Kunze, Andrés Fabián Lasagni

    Optics Express
    |October 19, 2017
    PubMed
    Summary
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    Direct laser interference patterning creates novel grating cell arrays for product protection. These diffraction-based security elements offer high flexibility and complexity to combat multi-billion dollar product piracy losses.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Applied Physics

    Background:

    • Product piracy causes significant global economic losses annually.
    • Advanced security elements are crucial for effective product protection.
    • Existing technologies may lack the required flexibility and complexity.

    Purpose of the Study:

    • To present the fabrication of novel diffraction-based security elements called grating cell arrays.
    • To demonstrate the use of direct laser interference patterning for creating these security elements.
    • To explore the potential of these elements in combating product piracy.

    Main Methods:

    • Utilizing ultraviolet two-beam interference patterning to structure PET substrates.
    • Creating line-like gratings within 80 µm diameter spots.

    Related Experiment Videos

  • Achieving spatial periods ranging from 0.7 µm to 2.2 µm.
  • Combining holographic surface gratings with variable spatial periods and orientations.

    • Main Results:

    • Successfully fabricated grating cell arrays with tunable diffraction properties.
    • Demonstrated the ability to store security information within the grating structures.
    • Security information visualization is possible using coherent light sources like laser pointers.

    Conclusions:

    • Direct laser interference patterning is an effective method for fabricating complex diffraction-based security elements.
    • Grating cell arrays offer a promising solution for high-security product protection.
    • The developed technology provides a flexible and complex approach to combatting product piracy.