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Multifunctional Random-Laser Smart Inks.

Chen-You Su1, Cheng-Fu Hou1, Yun-Tzu Hsu1

  • 1Department of Physics, National Taiwan University, Taipei 10617, Taiwan.

ACS Applied Materials & Interfaces
|October 15, 2020
PubMed
Summary
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Researchers developed a novel random laser (RL) "smart ink" for optical encoding. This transient ink offers secure, invisible signatures for anticounterfeiting and identification applications.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Information Security

Background:

  • Random lasers (RLs) possess unique properties like high intensity, narrow spectral linewidth, and broad-angular emission, making them attractive for various applications.
  • Existing optical-encoded technologies face challenges in security, anticounterfeiting, and identification, necessitating advanced solutions.

Purpose of the Study:

  • To propose and demonstrate a transient random laser (RL) "smart ink" for advanced optical-encoded technologies.
  • To explore the application of RL smart ink in security printing, military friend or foe identification (FFI), and document anticounterfeiting.

Main Methods:

  • Development of a transient RL 'smart ink' based on the unique properties of random lasers.
  • Demonstration of invisible signatures encoded via spectral differences between spontaneous emission and RL emission under specific conditions.
Keywords:
optical encryptionphotonic barcoderandom lasersecurity printingsmart ink

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  • Exploitation of RL threshold tunability to confirm multibit data encoding capabilities.

    • Main Results:

    • Successful creation of invisible signatures using the RL smart ink, encoding messages through spectral characteristics.
    • Confirmation of multibit data encoding by tuning the RL threshold.
    • Demonstration of the ink's transient nature and applicability to freeform surfaces of diverse materials.

    Conclusions:

    • The proposed RL smart ink offers a facile manufacturing process and versatile applications in optical encoding.
    • This technology shows significant potential for practical implementation in security, identification, and anticounterfeiting sectors.
    • The transient and adaptable nature of the smart ink paves the way for next-generation secure optical solutions.