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Researchers developed novel 3D printed optical fireworks for anticounterfeiting. These labels create vibrant, virtual 3D color objects using incoherent light, offering a new passive security solution.

Keywords:
anticounterfeitingcolor-filtering microlensescolorful spots floating 3D displaymultifocal color printingoptical fireworkstwo-photon polymerization 3D printing

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Colorful 3D prints show potential for anticounterfeiting labels.
  • Existing 3D displays often require lasers or are not passive.
  • There is a need for passive, visually striking anticounterfeiting solutions.

Purpose of the Study:

  • To report a novel concept for virtual 3D color objects using 3D printing.
  • To demonstrate independent control over color and apparent height of 3D focal spots.
  • To introduce a new type of passive anticounterfeiting label.

Main Methods:

  • Designing 3D printed microlens profiles and nanopillar heights.
  • Utilizing nanopillars as structural-color filters for specific wavelengths.
  • Illuminating the 3D printed structures with incoherent white light.

Main Results:

  • Colorful focal spots appeared as virtual 3D objects in free space.
  • Colors and apparent heights of spots were independently controlled.
  • The phenomenon was termed 'optical fireworks' due to focal plane shifts.

Conclusions:

  • The developed 3D printed optical fireworks offer a unique anticounterfeiting solution.
  • This technology integrates optical elements with nanostructures for 3D colorful displays.
  • The passive nature and striking visual effects make them suitable for security applications.