Programmable Coloration and Patterning on Reconfigurable Chiral Photonic Paper
Programmable Coloration and Patterning on Reconfigurable Chiral Photonic Paper
复制标题
可重构手性光子纸上的可编程着色和图案
DOI：
10.1002/adom.202102108
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发表时间：
2022-01-08
影响因子：
9
通讯作者：
Yu, Yanlei
中科院分区：
文献类型：
--
作者：
Cui, Shuzhen;Qin, Lang;Yu, Yanlei
响应性光子晶体被广泛用于构建可重写纸张，其中通过颜色切换重复写入和擦除图案。其工作原理主要在于周期性结构晶格常数的变化，但这限制了记录图案的局域色彩调谐，从而限制了多色信息的传输。在这里，报道了一种新的策略来写入、擦除，并且重要的是通过开发独特的光驱动胆甾相液晶(CLCs)来调节颜色，这种液晶具有具有节距长度(晶格常数)和螺旋轴(重新配置)两个结构元素的自组织螺旋超结构。螺旋轴的重新配置提供了两种高对比度光学状态，用于通过压力和电进行写入和擦除，而节距长度的精确光控制有助于局部颜色调节。这些特性主要利用了具有不同光稳定颜色的光驱动CLC，这种光驱动的CLC是由新设计的双手性系统诱导的，并限制在聚合物分散的液晶层中。以可编程的方式在可重写的光子纸上机械地写入、光学调谐和电擦除不同的多色图案。这种光子纸具有以可视化颜色信息和用户交互显示技术记录、编程和记忆光学寻址图像的潜力。
Responsive photonic crystals are widely employed to construct rewritable paper, where patterns are written and erased repeatedly via color switching. The working principle mainly lies in the changes on the lattice constant of periodic structures, which, however, restricts the localized color tuning of the recorded patterns and thus limits multicolor information transfer. Herein, a novel strategy is reported to write, erase, and importantly to tune the colors by developing unique light-driven cholesteric liquid crystals (CLCs) that possess self-organized helical superstructures with two structural elements of pitch lengths (lattice constant) and helical axes (reconfiguration). Reconfiguration of the helical axes provides two high-contrast optical states for writing and erasing by pressure and electricity, whereas precise photocontrol of the pitch lengths contributes to localized color tuning. These features primarily capitalize on the light-driven CLC with diverse photostationary colors, which is induced by a newly designed binary chiral system and confined in the polymer dispersed liquid crystal layer. Distinct multicolor patterns are mechanically written, optically tuned, and electrically erased on the rewritable photonic paper in a programmable manner. Such photonic paper has potential to record, program, and remember optically addressed images in visualized color information and user-interactive display technologies.