Dynamic multimodal holograms of conjugated organogels via dithering mask lithography
Dynamic multimodal holograms of conjugated organogels via dithering mask lithography
复制标题
DOI：
10.1038/s41563-020-00866-4
复制
发表时间：
2021-01-04
期刊：
影响因子：
41.2
通讯作者：
Lee, Jiseok
中科院分区：
文献类型：
--
作者：
Oh, Jongwon;Baek, Dahye;Lee, Jiseok
聚合物材料已被用于实现光学系统，该光学系统通过其结构或光学性质的周期性变化与产生光的全息信号相互作用。复杂的全息系统也可以通过暴露在外部刺激下进行动态控制，但它们通常只包含单一类型的全息模式。在这里，我们报告了一种共轭有机凝胶，它可以在一个体系结构中可逆地显示三种模式的全息图。利用抖动掩模光刻技术，在共轭聚二乙炔上实现了不同交联度的二维图形。在质子溶剂中，有机凝胶各向异性收缩，沿着第三维形成光学和结构不均匀，在荧光和明场显微镜成像中以三维全视差信号的形式显示全息图。在非质子化的溶剂中，随着有机凝胶的膨胀，这些不均一性减弱，恢复了二维周期性，显示了基于虹彩结构颜色的第三种全息模式。我们的研究提出了一种用于多级加密技术的新一代全息图制作方法，在共轭聚二乙炔薄膜中实现不同交联度的周期图案，同时在相同的聚合物结构中产生多个全息图像-所有图像都对各种溶剂的暴露做出动态响应。
Polymeric materials have been used to realize optical systems that, through periodic variations of their structural or optical properties, interact with light-generating holographic signals. Complex holographic systems can also be dynamically controlled through exposure to external stimuli, yet they usually contain only a single type of holographic mode. Here, we report a conjugated organogel that reversibly displays three modes of holograms in a single architecture. Using dithering mask lithography, we realized two-dimensional patterns with varying cross-linking densities on a conjugated polydiacetylene. In protic solvents, the organogel contracts anisotropically to develop optical and structural heterogeneities along the third dimension, displaying holograms in the form of three-dimensional full parallax signals, both in fluorescence and bright-field microscopy imaging. In aprotic solvents, these heterogeneities diminish as organogels expand, recovering the two-dimensional periodicity to display a third hologram mode based on iridescent structural colours. Our study presents a next-generation hologram manufacturing method for multilevel encryption technologies.Periodic patterns with varying cross-linking densities are realized in conjugated polydiacetylene films, creating multiple holographic images-all dynamically responsive to exposure to various solvents-simultaneously in the same polymeric structures.