Flower Inspiration: Broad-Angle Structural Color through Tunable Hierarchical Wrinkles in Thin Film Multilayers
Flower Inspiration: Broad-Angle Structural Color through Tunable Hierarchical Wrinkles in Thin Film Multilayers
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花的灵感：通过薄膜多层膜中可调的分层皱纹实现广角结构颜色
DOI：
10.1002/adfm.202006256
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发表时间：
2020-10-26
影响因子：
19
通讯作者：
Crosby, Alfred J.
中科院分区：
文献类型：
--
作者：
Chen, Chao;Airoldi, Chiara A.;Crosby, Alfred J.
当纳米尺度的表皮脊覆盖在凸起的表皮细胞上时，一些花的花瓣形成了层次结构。这些层次结构可以拓宽彩虹色的可观察角度。由此产生的光学效应提高了传粉者的觅食效率。尽管人们一直致力于模仿这种独特的广角结构色，但在合成模型中仍然缺乏天然系统提供的内在可调性来控制这种加宽的光谱。开发了一种分层系统，该系统提供了调整结构颜色的可观察角度的基于分层结构的结构。激光衍射测量表明，可观察到的反射角与所施加的压缩应变的平方根成比例地变宽。形态控制衍射图案：小皱纹控制衍射角，大皱纹扩大可观察范围。产生这种广角结构色的多模式反射系统的开发仅发生在有限的条件范围内，这些条件是实验发现和理论建模的。如果没有衍射小褶皱，单次衍射模式不会显示结构色。控制的花瓣模式模仿的可调性，这给了新的洞察自然系统，并提供了一个强大的基础，可调的结构颜色控制。
The petals of some flowers form hierarchical structures when nano-scale cuticular ridges overlay bulged epidermal cells. These hierarchical structures can broaden the observable angles of iridescence. The resulting optical effect enhances the foraging efficiency of pollinators. Although efforts have been devoted to mimicking this unique broad-angle structural color, the intrinsic tunability offered by natural systems to control such a broadened spectrum is still absent in synthetic models. A hierarchical system is developed that provides hierarchical wrinkle-based structures that tune the observable angles for structural color. Laser diffraction measurements demonstrate that the observable angle of reflectance is broadened in proportion to the square root of the applied compressive strain. The morphology controls the diffraction pattern: the small wrinkles control the diffraction angles and the large wrinkles broaden the observable range. The development of a multi-mode wrinkling system to produce this broad-angle structural color only occurs within a limited range of conditions, which are experimentally discovered and theoretically modeled. Without diffractive small wrinkles, single wrinkling modes do not display structural colors. The control of wrinkling modes mimics the tunability of petals, which gives new insight into the natural system and provides a robust foundation for tunable structural color control.