光子晶体平板的地下阵列在蜣螂中产生绿色条纹
A subsurface array of photonic crystal slabs produces green stripes in a scarab beetle
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中文总结 AI 辅助
研究揭示提琴蜣螂绿色条纹的光子晶体平板复合分层结构，通过光学建模解析其虹彩与漫射绿色的形成机制，拓展生物光子纳米结构多样性并为仿生设计提供新灵感。
中文摘要 AI 辅助
自然界中的鲜艳色彩通常源自光子纳米结构，这些结构已启发了多种技术，但大多数已知实例属于有限的结构类型。本文描述了提琴蜣螂（*Eupoecila australasiae*）明亮绿色提琴形条纹中一种兼具生物学和光学新颖性的结构。该绿色由复合分层结构产生，该结构包含位于表皮下方的密集微鳍状元件阵列，每个垂直鳍带有纳米球与凹痕的互补晶格图案，可近似为安装在实心中心核上的两个光子晶体平板。光学建模显示，这些鳍具有强虹彩特性，在法线附近反射较长波长的光，在倾斜角度反射较短波长的光；但鳍取向的无序性以及上方表皮的滤光作用，将鳍的蛋白石青色外观转化为外部可见的明亮漫射绿色。本研究拓展了已知生物光子纳米结构的多样性，为仿生设计提供了新的灵感。
英文摘要
Vivid colours in nature often arise from photonic nanostructures that have inspired diverse technologies. Yet most known examples fall within a limited set of structural themes. Here, we describe a biologically and optically novel structure in the bright green, violin-shaped stripes of the fiddler beetle Eupoecila australasiae. The green colour is produced by a composite, hierarchical structure comprising dense arrays of microscopic, fin-like elements located beneath the cuticle. Each vertical fin, patterned with complementary lattices of nanospheres and indentations, can be approximated by two photonic crystal slabs mounted on a solid central core. Optical modelling shows that the fins are strongly iridescent, reflecting light with longer wavelengths near the normal and light with shorter wavelengths at oblique angles. However, disorder in fin orientation and filtering by the overlying cuticle converts the opaline cyan appearance of the fins into the bright diffuse green seen externally. Our work expands the known diversity of biological photonic nanostructures and offers new inspiration for biomimetic designs.
