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Spatiotemporally Encoded Plasmonic Structural Coloration for Multilevel Information Encryption and Anticounterfeiting
Shaofeng Guo1, Lin Zheng1, Jia Liu1
1State Key Laboratory of Optoelectronic Materials and Technologies, Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
This study introduces a novel dynamic coloration platform using pixelated moisture-sensitive resonators for enhanced information capacity. It enables spatiotemporally encoded structural colors and multilevel encryption without external systems.
Area of Science:
- Optics and Photonics
- Materials Science
- Information Security
Background:
- Metasurface-based dynamic structural colors are crucial for displays and security.
- A key challenge is achieving spatiotemporally encoded colors to boost information capacity.
Purpose of the Study:
- To demonstrate a spatiotemporally encoded dynamic coloration platform using pixelated moisture-sensitive Fabry-Pérot resonators.
- To enable multilevel information encryption and enhance information capacity.
Main Methods:
- Fabrication of pixelated Fabry-Pérot resonators with tailored gold layer porosity and thickness.
- Tuning moisture-driven response times of individual resonators from seconds to minutes.
- Utilizing localized water molecule diffusion kinetics for self-regulation.
Main Results:
- Experimental demonstration of a spatiotemporally encoded dynamic coloration platform.
- Precise tuning of resonator response times (2s to minutes) via localized material properties.
- Successful implementation in humidity-time dual-lock encryption and time-cascaded QR codes.
- Demonstrated stability across wide humidity (30-90% RH) and temperature (20-70 °C) ranges, and observation angles (0-70° viewing, 0-90° polarization).
Conclusions:
- The developed platform offers a new pathway for spatiotemporally encoded plasmonic structural coloration and multilevel information encryption.
- The system exhibits high stability and adaptability, showing great potential for high-security, high-capacity information security applications.
- This work advances active meta-optics for innovative security solutions.
