Multi-wavelength excitation-dependent fluorescence with dynamic color gradients for information encryption and anti-counterfeiting

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(30), P. 11497 - 11505

Published: Jan. 1, 2024

The unprecedented security labels have multi-excitation wavelength triggered triple-mode polychromatic and dynamic color-gradient features, offering a new development direction for future information encryption anti-counterfeiting technologies.

Language: Английский

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Multilevel Anti-counterfeiting Barcode with Enhanced Information Encryption Based on Stimulus-Responsive Digital Polymers

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(33), P. 43075 - 43082

Published: July 17, 2024

In response to the escalating challenges of counterfeiting due technological and socioeconomic advancements, a novel trilevel anti-counterfeiting Quick Response (QR) code system has been developed. This integrates digital polymers with QR stimulus-responsive chromophores,

Language: Английский

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Femtosecond Laser‐Induced Recrystallized Nanotexturing for Identity Document Security With Physical Unclonable Functions

Advanced Science, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 11, 2024

Counterfeit identity (ID) documents pose a serious threat to personal credit and national security. As promising candidate, optical physical unclonable functions (PUFs) offer robust defense mechanism against counterfeits. Despite the innovations in chemically synthesized PUFs, challenges persist, including harmful chemical treatments, low yields, incompatibility of reaction conditions with ID document materials. More notably, surface relief nanostructures for such as wrinkles, are still at risk being replicated through scanning lithography or nanoimprint. Here, femtosecond laser-induced recrystallized silicon nanotexture is reported latent PUF nanofingerprint anti-counterfeiting. With laser irradiation, nanotextures spontaneously emerge within 100 ms exposure. By introducing low-absorption metal layer, plasmon polariton waves excited on silicon-metal multilayer nanofilms long-range boosting, ensuring uniqueness non-replicability final nanotextures. Furthermore, induces phase transition from amorphous polycrystalline state, rather than creating replicable wrinkles. The random easily identifiable microscopy Raman imaging, yet they remain undetectable by characterization methods electron atomic force microscopies. This property significantly hinders counterfeiting efforts, it prevents precise replication these nanostructures.

Language: Английский

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Advanced Optical Encryption Using Tunable Color and Polarization Separation in In-Situ Polymerized Chiral Liquid Crystals

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 17, 2025

With the rapid advancement of modern communication technologies, safeguarding information against forgery and unauthorized access has become increasingly critical, driving interest in advanced optical encryption systems. These systems excel parallel image data processing, enabling swift detection verification sensitive information. However, traditional light-based encoding methods are constrained by their limited dependence on static parameters such as light wavelength intensity lack dynamic, reversible adaptability. To overcome these limitations, we propose an cryptography system that utilizes tunable color polarization selectivity situ polymerized, multicolor patterned chiral liquid crystals. This capitalizes multifunctional properties crystals, including thermally induced phase transitions allow repeatable tuning, rendering encoded unidentifiable until specific conditions met. Furthermore, incorporates disguising mechanisms through separation, revealing accurate only under predefined conditions. Key to its enhanced functionality is integration circular selectivity, electrically switchable separation. feature facilitates display distinct right- or left-handed circularly polarized light. By exploiting dynamic our offers a multilevel platform significantly enhances security. versatile approach surpasses limitations conventional methods, providing robust solution for secure anticounterfeiting applications.

Language: Английский

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Multicolor Afterglow Obtained by In Situ Synthesis of CsPbBr3 Quantum Dots within Porous SiO2 on the Surface of Sr2MgSi2O7:Eu2+,Dy3+

Ceramics International, Journal Year: 2025, Volume and Issue: unknown

Published: March 1, 2025

Language: Английский

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