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Updated: Mar 17, 2026

Patterning via Optical Saturable Transitions - Fabrication and Characterization

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Published on: December 11, 2014

Bioinspired Unclonable 2D Photonic Crystal Patterns with Multimode Reversible Switching for Anticounterfeiting

Wenhui Tu¹, Zhiliang Li¹, Kai Yu¹

¹Qingdao University of Science & Technology, State Key Laboratory of Advanced Optical Polymer and Manufacturing Technology, Qingdao 266042, P. R. China.

ACS Applied Materials & Interfaces

|March 16, 2026

Summary

This summary is machine-generated.

This study introduces an unclonable, tree-ring-inspired photonic crystal (PC) system for advanced anticounterfeiting. The novel design offers random, irreplicable patterns and dynamic color switching for enhanced product authentication.

Keywords:

2D photonic crystals anticounterfeiting reversible switching structural colors unclonable patterns

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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

Area of Science:

Materials Science
Optics
Nanotechnology

Background:

Growing demand for information security and product authentication challenges existing anticounterfeiting technologies.
Photonic crystal (PC)-based optical methods offer dynamic color regulation but face limitations in replication susceptibility and material fatigue.

Purpose of the Study:

To develop an advanced, highly secure anticounterfeiting system inspired by natural patterns.
To overcome the limitations of current PC-based anticounterfeiting technologies.

Main Methods:

Fabrication of a two-dimensional (2D) PC system using nanospheres of varying sizes within a polymer matrix (polyethylene glycol diacrylate 200-vinyl methacrylate).
Integration of concentric periodic structures to mimic tree rings.
In situ pattern formation using controlled injection and Marangoni effects.

Main Results:

Achieved inherently random and irreplicable "tree-ring" patterns, providing "unclonable" security features.
Demonstrated multi-color-switching capabilities through different wetting modes (full immersion and unilateral wetting).
Exhibited brilliant, angle-dependent structural colors without requiring responsive substrates.

Conclusions:

The proposed 2D PC system offers a robust and simplified fabrication strategy for advanced anticounterfeiting.
The "unclonable" nature and dynamic color switching enhance verification reliability for product authentication.