Structural colors with embedded anti-counterfeit features fabricated by laser-based methods
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866916210232262656 |
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| author | Teutoburg-Weiss, Sascha Soldera, Marcos Bouchard, Felix Kreß, Joshua Vaynzof, Yana Lasagni, Andrés Fabián |
| author_facet | Teutoburg-Weiss, Sascha Soldera, Marcos Bouchard, Felix Kreß, Joshua Vaynzof, Yana Lasagni, Andrés Fabián |
| contents | Structural colors can be induced on metals not only to fabricate logos or decorative motives but also to embed anti-counterfeit features for product protection. In this study, stainless steel (EN 1.4301) plates are colorized by growing a thin oxide layer using direct laser writing (DLW) and hidden anti-counterfeit measures are included on their surfaces by direct laser interference patterning (DLIP) processing. The periodic microstructures resulting from the DLIP treatment have a spatial period of 1 um and act as relief diffraction gratings, featuring a characteristic diffraction pattern. These microstructures are not visible to the human eye but are easily detectable upon shining a coherent beam on the surface. Furthermore, the reflectance over the visible spectrum of the colorized surfaces with and without the DLIP microtexture is measured, giving low differences in the color perception following the so-called "CIE L*a*b*" color space. Finally, a demonstrator is fabricated, in which colorized fields with and without the security features are shown. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_11254 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Structural colors with embedded anti-counterfeit features fabricated by laser-based methods Teutoburg-Weiss, Sascha Soldera, Marcos Bouchard, Felix Kreß, Joshua Vaynzof, Yana Lasagni, Andrés Fabián Optics Materials Science Structural colors can be induced on metals not only to fabricate logos or decorative motives but also to embed anti-counterfeit features for product protection. In this study, stainless steel (EN 1.4301) plates are colorized by growing a thin oxide layer using direct laser writing (DLW) and hidden anti-counterfeit measures are included on their surfaces by direct laser interference patterning (DLIP) processing. The periodic microstructures resulting from the DLIP treatment have a spatial period of 1 um and act as relief diffraction gratings, featuring a characteristic diffraction pattern. These microstructures are not visible to the human eye but are easily detectable upon shining a coherent beam on the surface. Furthermore, the reflectance over the visible spectrum of the colorized surfaces with and without the DLIP microtexture is measured, giving low differences in the color perception following the so-called "CIE L*a*b*" color space. Finally, a demonstrator is fabricated, in which colorized fields with and without the security features are shown. |
| title | Structural colors with embedded anti-counterfeit features fabricated by laser-based methods |
| topic | Optics Materials Science |
| url | https://arxiv.org/abs/2404.11254 |