Valyukh Sergiy, Järrendahl Kenneth
Appl Opt. 2017 Mar 20;56(9):2510-2516. doi: 10.1364/AO.56.002510.
Some beetles of the family Scarabaeidae produce brilliant metallic-looking colors by their pure dielectric exoskeletons and reflect light with a high degree of circular polarization. In the present work, we discuss three models for simultaneously describing scattering, spectral, and polarization characteristics of scarab beetles. Each model consists of three slabs: an outer thin epicuticle, an exocuticle having a helicoidal structure, and a thick uniform slightly absorbing endocuticle. Scattering features are defined by rough interfaces of the epicuticle and/or nonuniformities of the exocuticle. As an example, a slightly modified model of an earlier study of Chrysina aurata is considered. The modification is aimed at including surface and volume nonuniformities that affect not only spectral and polarization properties but also scattering. Another example of using the proposed models is based on the analysis of image formations of a specimen of the species Mimela chinensis, which was studied in a polarizing microscope at different magnifications. The results show that the proposed models can be applied for explanation of light interaction with the exoskeletons of scarab beetles.
金龟子科的一些甲虫通过其纯介电外骨骼产生明亮的金属色泽，并以高度圆偏振反射光。在本研究中，我们讨论了三种用于同时描述金龟子甲虫散射、光谱和偏振特性的模型。每个模型由三个平板组成：一个外部薄的上表皮、一个具有螺旋结构的外表皮和一个厚的均匀且略有吸收的内表皮。散射特征由上表皮的粗糙界面和/或外表皮的不均匀性定义。例如，考虑了对早期关于金绿金龟研究的一个略微修改的模型。该修改旨在纳入不仅影响光谱和偏振特性，还影响散射的表面和体积不均匀性。使用所提出模型的另一个例子基于对中华丽金龟标本图像形成的分析，该标本在偏振显微镜下以不同放大倍数进行了研究。结果表明，所提出的模型可用于解释光与金龟子甲虫外骨骼的相互作用。
