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Related Experiment Video

Updated: Mar 20, 2026

Soft Lithographic Functionalization and Patterning Oxide-free Silicon and Germanium
12:38

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Lithographically Encrypted Inverse Opals for Anti-Counterfeiting Applications.

Yongjoon Heo1, Hyelim Kang1, Joon-Seok Lee1

  • 1Department of Chemical and Biomolecular Engineering (BK21+ Program), KAIST, Daejeon, 305-701, South Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|June 4, 2016
PubMed
Summary

This study introduces a new method for advanced security using photonic crystals. It encrypts graphical and spectral codes in inverse opals, which are revealed using a specific aqueous solution.

Keywords:
anti-counterfeitingcolloidal crystalsencryptioninverse opalsselective infiltration

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Colloidal photonic crystals exhibit unique optical properties like structural color.
  • These properties make them suitable for security applications.
  • Advanced encryption methods are needed for robust security materials.

Purpose of the Study:

  • To develop a novel method for encrypting graphical and spectral codes in polymeric inverse opals.
  • To enhance security features using regioselective surface modification.
  • To create a combinatorial security code revealed by a specific decoding agent.

Main Methods:

  • Preparation of lithographically patterned hydrophobic inverse opals.
  • Regioselective surface modification of air cavities to achieve hydrophilicity using micropatterns as shadow masks.
  • Decoding using infiltration of a specific aqueous solution.

Main Results:

  • Encrypted inverse opals exhibit regioselectively red-shifted structural colors, revealing graphical codes.
  • Decoded inverse opals display unique reflectance spectral codes from distinct regions.
  • A combinatorial code (graphical and spectral) is successfully revealed upon decoding.
  • The encryption method demonstrates chemical stability, high reproducibility, and mechanical robustness.

Conclusions:

  • This novel encryption technology offers advanced security through combined graphical and spectral codes.
  • The method provides invariant and reproducible codes, suitable for various security applications.
  • The ability to transfer films onto different surfaces broadens the application scope.