Chen Yu-Han, Chen Huei-Yin, Lai Chung-Jui, Hsu Jung-Hsuan, Lin Kun-Yi Andrew, Yang Hongta
Department of Chemical Engineering, National Chung Hsing University, 145 Xingda Road, Taichung City 40227, Taiwan.
Department of Environmental Engineering, National Chung Hsing University, 145 Xingda Road, Taichung City 40227, Taiwan.
Langmuir. 2021 Aug 10;37(31):9490-9503. doi: 10.1021/acs.langmuir.1c01341. Epub 2021 Aug 1.
Randomly arranged inclined irregular nanostructure-covered blue-tailed forest hawk dragonfly wings are highly transparent for wide viewing angles. Inspired by the dragonfly wings, monolayer silica colloids are self-assembled on shape memory polymer-coated substrates and utilized as plasma etching masks to pattern disorderly arranged inclined irregular conical structures. The structures build gradual refractive index transitions at various angles of incidences, resulting in omnidirectional antireflection performance over the whole visible wavelength region. In comparison with a bare substrate, the optimized structure-covered substrate presents 10% higher optical transmission at 0° and even 41% higher optical transmission at an angle of incidence of 75°. Importantly, by manipulating the structural configuration of the shape memory polymer-based structures, the corresponding antireflection characteristics can be instantaneously and reversibly eliminated and recovered after drying out of common household liquids or applying contact pressures in ambient environments. The tunable omnidirectional antireflection coatings are prospective candidates for realizing optical modulation, which exhibits an enormous application value in smart windows, intelligent display screens, optical components, and novel optoelectronic devices.
随机排列的、覆盖着倾斜不规则纳米结构的蓝尾林鹰蜻蜓翅膀在宽视角下具有高度透明性。受蜻蜓翅膀启发，单层二氧化硅胶体在形状记忆聚合物涂层基板上自组装，并用作等离子体蚀刻掩膜以形成无序排列的倾斜不规则锥形结构。这些结构在不同入射角处构建渐变的折射率过渡，从而在整个可见波长区域实现全向抗反射性能。与裸基板相比，优化后的结构覆盖基板在0°时的光透射率提高了10%，在75°入射角时甚至提高了41%。重要的是，通过操纵基于形状记忆聚合物的结构的构造，在普通家用液体干燥或在环境中施加接触压力后，相应的抗反射特性可以瞬间且可逆地消除和恢复。这种可调谐的全向抗反射涂层是实现光调制的潜在候选材料，在智能窗户、智能显示屏、光学元件和新型光电器件中具有巨大的应用价值。
