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Related Concept Videos

IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
The...

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Updated: Jul 7, 2026

Nanomoulding of Functional Materials, a Versatile Complementary Pattern Replication Method to Nanoimprinting
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Femtosecond Laser-Induced Recrystallized Nanotexturing for Identity Document Security With Physical Unclonable

Panpan Niu1, Jiao Geng1,2, Qilin Jiang1

  • 1Hangzhou Institute of Technology, Xidian University, Hangzhou, 311231, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 11, 2024
PubMed
Summary

This study introduces a novel anti-counterfeiting method using laser-induced silicon nanotextures as unique physical unclonable functions (PUFs) for identity documents. These latent nanofingerprints are non-replicable and undetectable by standard surface analysis, enhancing document security.

Keywords:
anti‐counterfeitingfemtosecond lasernanotexturephysical unclonable functionssilicon

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Counterfeit identity documents threaten personal credit and national security.
  • Optical physical unclonable functions (PUFs) offer a defense, but existing methods face challenges like chemical treatments and replicable surface structures.
  • Replicable nanostructures, such as wrinkles, are vulnerable to advanced counterfeiting techniques like nanoimprint.

Purpose of the Study:

  • To develop a novel, non-replicable latent physical unclonable function (PUF) nanofingerprint for enhanced document anti-counterfeiting.
  • To overcome limitations of existing PUF technologies, including chemical synthesis issues and the risk of replicating surface relief structures.
  • To create a robust security feature for identity documents that is difficult to counterfeit.

Main Methods:

  • Utilizing femtosecond laser irradiation to induce spontaneous recrystallized silicon nanotextures on silicon-metal multilayer nanofilms.
  • Exciting surface plasmon polariton waves with a low-absorption metal layer to ensure nanotexture uniqueness and non-replicability.
  • Inducing a phase transition from amorphous to polycrystalline silicon via laser, creating latent, non-relief structures.

Main Results:

  • Spontaneous emergence of unique nanotextures within 100 ms of femtosecond laser exposure.
  • Long-range boosting of surface plasmon polariton waves ensures non-replicability of the final nanostructures.
  • Latent nanotextures are identifiable via optical microscopy and Raman imaging but undetectable by scanning electron microscopy (SEM) and atomic force microscopy (AFM).

Conclusions:

  • Femtosecond laser-induced recrystallized silicon nanotextures serve as effective latent PUF nanofingerprints for document anti-counterfeiting.
  • The unique, non-replicable, and undetectable nature of these nanostructures significantly hinders counterfeiting attempts.
  • This approach offers a promising, secure, and material-compatible alternative to existing PUF technologies for identity document protection.