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Amorphous Photonic Structure Patterns with Thin Film Interference Effects for Multilevel Anticounterfeiting.

Jingran Huang1, Yin Yin1, Guiwu Liu1

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Summary

Amorphous photonic structures (APSs) with thin film interference offer advanced anticounterfeiting features. These structures provide unique optical properties and physical unclonable functions (PUFs) for enhanced security applications.

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Area of Science:

  • Photonics
  • Materials Science
  • Optics

Background:

  • Colloidal photonic structures offer tunable light manipulation with potential for anticounterfeiting.
  • Complex photonic structures are challenging to design and manufacture for robust security applications.
  • Existing anticounterfeiting methods require improvement in terms of durability and uniqueness.

Purpose of the Study:

  • To develop novel amorphous photonic structures (APSs) with multilevel anticounterfeiting capabilities.
  • To investigate the integration of thin film interference (TFI) effects and fluorescence for enhanced security.
  • To leverage infiltration-assisted (IFAST) colloidal assembly for creating unique structural features.

Main Methods:

  • Fabrication of APSs incorporating TFI effects through colloidal assembly.
  • Incorporation of fluorescent microspheres into APSs for a multi-modal security approach.
  • Utilizing infiltration-assisted (IFAST) colloidal assembly to achieve specific microscale structural arrangements.

Main Results:

  • APSs exhibited dynamic specular and diffuse color-shifting properties due to resonant scattering and partial TFI.
  • A third layer of fluorescent anticounterfeiting was achieved by incorporating fluorescent microspheres.
  • The unique microscale features and color distributions of APSs provide inherent fingerprint-like characteristics.

Conclusions:

  • The developed APSs demonstrate significant potential as optical physical unclonable function (PUF) security labels.
  • The combination of optical and structural unpredictability prevents replication and tampering.
  • AI-based reading and authentication methods can be employed for verifying the authenticity of these security labels.