Institute of Physics Belgrade, Pregrevica 18, 11080 Zemun, Belgrade, Serbia.
State Key Lab of Metal Matrix Composite, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
Soft Matter. 2021 Jul 7;17(26):6477-6485. doi: 10.1039/d1sm00157d.
Structural and pigment colorations are omnipresent in insects, producing a range of colors for camouflage, warning, mimicry and other strategies necessary for survival. Structural coloration has attracted a lot of attention due to its significance in biophotonics, biomimetics and even esthetic appeal. The coupling of structural and pigment colorations has been largely unnoticed. Herein we show how pigments, scattering and interference work together in two-dimensional waveguiding structures to produce the coloration of Jordanita globulariae (Huebner, 1793), a moth whose forewings sparkle with slightly iridescent green scales. We show that subwavelength structures scatter and couple light into a concave multilayered structure to enhance the absorption of pigments. A finite element method (FEM) model, adequately describing the photonic properties of J. globulariae, was developed based on the nanoscale architecture of the insect's wing scales. The principle of absorption enhanced by scattering and waveguiding is present in many insect species and might be imitated to tailor the spectral properties of optical devices.
结构色和色素色斑在昆虫中无处不在，为伪装、警告、拟态和其他生存策略提供了一系列颜色。结构色因其在生物光子学、仿生学甚至美学吸引力方面的重要性而引起了广泛关注。结构色和色素色斑的结合在很大程度上被忽视了。本文展示了色素、散射和干涉如何在二维波导结构中协同工作，产生球状飞蛾（Jordanita globulariae）（Huebner，1793）的颜色，这种飞蛾的前翅闪烁着略微虹彩的绿色鳞片。我们表明，亚波长结构会散射并耦合光进入凹形多层结构，以增强色素的吸收。基于昆虫翅膀鳞片的纳米级结构，开发了一个有限元方法（FEM）模型，该模型可以充分描述 J. globulariae 的光子特性。散射和波导增强吸收的原理存在于许多昆虫物种中，并且可以模仿来调整光学器件的光谱特性。
