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  3. Unclonable Three-level Holograms For Two-factor Visual Authentication Via One-step Cascade-nanostructure Imprinting.
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  3. Unclonable Three-level Holograms For Two-factor Visual Authentication Via One-step Cascade-nanostructure Imprinting.

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Unclonable Three-Level Holograms for Two-Factor Visual Authentication via One-Step Cascade-Nanostructure Imprinting.

Jinhyeok Yang1, Myeonggyu Choi2, Ji-Hwan Ha3

  • 1Department of Control and Instrumentation Engineering, Korea University, Sejong 30019, Republic of Korea.

Nano Letters
|June 18, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

This study introduces a novel, low-cost hologram film with unique nanostructures for robust two-factor authentication. This physically unclonable technology enhances product security against advanced cyber threats.

Keywords:
Diffractive optical elements (DOEs)Microloading effectNanoimprint lithography (NIL)Three-level cascade nanostructureTwo-factor authentication

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Area of Science:

  • Materials Science and Engineering
  • Optics and Photonics
  • Cybersecurity and Authentication Technologies

Background:

  • Digital authentication faces escalating threats from artificial intelligence and cyberattacks.
  • There is a growing need for physically unclonable and visually verifiable authentication methods.
  • Analog security approaches are gaining traction as a complement to digital systems.

Purpose of the Study:

  • To develop a cost-effective method for fabricating large-area hologram films with cascade nanostructures.
  • To establish a robust two-factor authentication platform utilizing these advanced hologram films.
  • To enhance anticounterfeiting capabilities for diverse product applications.

Main Methods:

  • Fabrication of three-level silicon master molds using a single dry-etching step.
  • Replication of hologram films via nanoimprint lithography.
  • Integration of computer-generated holography (CGH) to suppress conjugate images.
  • Incorporation of fiducial marks for localized nanopattern inspection and security code generation.

    • Main Results:

    • Successful development of large-area hologram films with cascade nanostructures.
    • Demonstration of instant visual authentication using a portable flashlight by suppressing conjugate images.
    • Enabling secondary verification through a portable microscope analyzing local nanopatterns as security codes.
    • Achieved high fidelity, durability, and cost-effectiveness in the fabrication process.

    Conclusions:

    • The proposed cascade-hologram strategy offers a powerful and versatile solution for product authentication.
    • This physically unclonable technology provides enhanced anticounterfeiting performance.
    • The platform is suitable for widespread deployment across various consumer goods and electronic devices.