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Buckling-Induced Angular-Switchable Diffraction Images on Polyurethane Film for Optical Encryption and
Shilong Zhong1,2, Yongjian Zhu1, Weien Liang1
1School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, China.
Advanced Materials (Deerfield Beach, Fla.)
|July 17, 2026
Summary
This study introduces advanced diffractive anti-counterfeiting labels using photosensitive polyurethane films. These labels offer enhanced security with multiple, angle-switchable images, overcoming limitations of traditional designs.
Area of Science:
- Materials Science
- Optics
- Nanotechnology
Background:
- Diffractive security images utilize micro-nano structures for anti-counterfeiting applications.
- Traditional diffraction anti-counterfeiting labels (DALs) have limitations in encryption complexity and environmental stability.
- Acrylic ester-based DALs are vulnerable to counterfeiting and environmental degradation.
Purpose of the Study:
- To develop novel, high-security diffractive anti-counterfeiting labels with enhanced encryption capabilities.
- To overcome the limitations of traditional DALs regarding information capacity and environmental resistance.
- To explore the use of photosensitive polyurethane (Pho-PU) films and buckling structures for multi-image encryption.
Main Methods:
- Fabrication of eight high-resolution, angular-switchable, independent diffraction images on Pho-PU films.
- Utilizing periodic buckling structures to control and reveal different encrypted images.
- Implementing an angle-multiplexing strategy for integrating common information and secret keys.
Main Results:
- Demonstrated the designability and controllability of periodic buckling structures for image encryption.
- Successfully integrated common information and secret keys through angle-multiplexing.
- Achieved multi-image encryption capabilities on a single Pho-PU film.
Conclusions:
- The proposed buckling structure-based approach offers a systematic method for multi-image encryption.
- This technique provides an effective alternative for fabricating high-security DALs with improved functionality.
- The developed Pho-PU films exhibit superior performance in harsh environments compared to traditional materials.
