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Patterning via Optical Saturable Transitions - Fabrication and Characterization

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Published on: December 11, 2014

Ethanol-responsive structural colors with multi-level information encryption based on the patterned three-layer

Yukun Liu¹, Zhipeng Meng¹, Senlin Miao¹

¹Research Institute of Clean Chemical Technology, School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, PR China.

Journal of Colloid and Interface Science

|July 31, 2024

Summary

This study introduces a novel ethanol-responsive inverse opal photonic crystal (IOPC) for multi-level information encryption. The structure enables complex decoding through tunable structural colors and stimuli-responsive layers, enhancing security applications.

Keywords:

Ethanol-responsive Information encryption Inverse opal photonic crystals Structural colors Three-layer structure

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Area of Science:

Materials Science
Nanotechnology
Optics

Background:

Stimulus-responsive inverse opal photonic crystals (IOPCs) offer tunable structural colors for information security.
Traditional bilayer structures have limitations in color information and decoding modes.

Purpose of the Study:

To develop an ethanol-responsive IOPC with multi-level information encryption capabilities.
To overcome the limitations of traditional bilayer structures by incorporating a functional layer.

Main Methods:

Fabrication of a three-layer IOPC with shielding layers (A and C) and a functional layer (B) containing a TiO2 nanoparticle QR code.
Utilizing distinct photonic stop band (PSB) positions and reflectance values for selective layer response.
Investigating the structural color changes and QR code visibility under different wetting conditions (individual sides vs. entire structure) and detection angles.

Main Results:

The functional layer's color is activated only when the entire structure is wetted, causing its PSB to redshift.
Individual wetting of shielding layers results in color dominance by the unwetted layer, revealing partial information.
Complete wetting decodes a blue QR code, and varying detection angles induce cascade decoding with single- or mixed-color outputs.

Conclusions:

The developed three-layer IOPC structure demonstrates multi-level information encryption through tunable structural colors and stimuli-responsive behavior.
This design provides a robust foundation for advanced information security applications.
The system allows for complex decoding strategies based on wetting conditions and viewing angles.