研究目的
Investigating the fabrication of dynamic holograms on polymer surfaces by direct laser writing for high-security anti-counterfeit applications.
研究成果
The study successfully demonstrated the fabrication of dynamic holograms on polymer surfaces using direct laser writing, showcasing their potential for high-security anti-counterfeit applications. The kinematic effect and colorful reconstructed images under white light illumination make these holograms easy to recognize and difficult to duplicate, offering a promising solution against counterfeit products.
研究不足
The study focuses on the fabrication and initial characterization of holograms for anti-counterfeit applications. The practical scalability, cost-effectiveness, and durability of these holograms in real-world applications were not extensively explored.
1：Experimental Design and Method Selection
The study employs a high-resolution ultraviolet direct laser writer to fabricate computer-generated holograms (CGH) with a laser spot size of 300 nm. The methodology includes the calculation of holographic data based on integration algorithm and the fabrication of holograms using direct laser writing (DLW) on polymer materials.
2：Sample Selection and Data Sources
A glass substrate was cleaned and coated with 2.2-μm-thick positive photoresist (S1818, Microposit) for the fabrication of holograms. The holographic data were generated from input bitmaps containing 256 gray scale levels.
3：List of Experimental Equipment and Materials
Direct laser writer (PicoMaster 100, 4PICO B.V), positive photoresist (S1818, Microposit), positive photoresist developer (FUJIFILM Electronic Materials U.S.A. Inc.), optical microscope (DM3 XL, LEICA Microsystems CMS GmbH).
4：Experimental Procedures and Operational Workflow
The fabrication process involved cleaning the glass substrate, coating it with photoresist, baking, exposing with the laser writer, developing, and cleaning. The laser density was set to 600 mJ/cm2, with a stepping distance of 150 nm and scanning speed of 200 mm/s.
5：Data Analysis Methods
The characteristics of the reconstructed images were analyzed under monochromatic and white light illumination. The kinematic effect and diffraction orders were studied to evaluate the hologram's potential for anti-counterfeit applications.
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