Total internal reflection (TIR)-based structural coloration is a brilliant strategy to overcome the need for periodic nanostructures and complex fabrication processes. Light entering the microdome structure undergoes TIR, and owing to varying reflection paths, it exhibits a color that changes with the microdome size. Although solution-based printing techniques have been proposed to achieve this effect, they fall short of full-color realization owing to resolution limitations. Herein, we achieved 3628 dpi of full-color and high-resolution structural color images by printing transparent microdome structures with 1.2–9.9 μm diameter using electrohydrodynamic (EHD) jet printing. Additionally, high-resolution EHD jet-printed structural color images display complex encoded information, enhancing the anticounterfeiting effectiveness through their fabrication simplicity and precise control over the microdome size. Because of these advantages, this TIR-based structural coloration technique with EHD jet printing is highly suitable for anticounterfeiting applications.

中文翻译：

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透明聚乙二醇微球的电动流体喷射打印基于高分辨率全内反射的结构着色


基于全内反射 （TIR） 的结构着色是克服对周期性纳米结构和复杂制造工艺需求的绝妙策略。进入微型球顶结构的光会经历 TIR，由于反射路径不同，它表现出的颜色会随着微型球体尺寸的变化而变化。尽管已经提出了基于解决方案的打印技术来实现这种效果，但由于分辨率限制，它们无法实现全彩。在此，我们通过使用电动流体动力学 （EHD） 喷射打印打印直径为 1.2-9.9 μm 的透明微球结构，实现了 3628 dpi 的全彩和高分辨率结构彩色图像。此外，高分辨率 EHD 喷射打印结构彩色图像显示复杂的编码信息，通过其制造简单性和对微球尺寸的精确控制来提高防伪效果。由于这些优势，这种基于 TIR 的结构着色技术和 EHD 喷射打印非常适合防伪应用。