Department of Chemistry, University of Utah, Salt Lake City, UT 84112, United States of America. Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112, United States of America.
Bioinspir Biomim. 2018 Apr 4;13(3):035003. doi: 10.1088/1748-3190/aaaf55.
The origin of the brilliant near angle-independent coloration of the weevil Eupholus chevrolati was investigated by a combination of optical and electron microscopy tools, photonic band structure calculations, and color mixing analysis. Optical microscopy and scanning micro-spectroscopy revealed the presence of micrometer-sized red, yellow, green, and blue reflective pixels covering the entire exoskeleton of the weevil. Scanning electron microscopy in combination with focused ion beam milling showed that each micro-pixel consisted of a diamond-based photonic crystal structure and the different reflective colors were the result of different orientations of the photonic crystal. Color mixing analysis was used to study the collective behavior of the reflective micro-pixels. A pointillist, additive color-mixing scheme of the reflective photonic crystal micro-pixels was determined as the origin of the weevil's bright and near angle-independent yellow-green coloration.
通过光学和电子显微镜工具、光子带结构计算和混色分析的组合，研究了象鼻虫 Eupholus chevrolati 绚丽的近角无关变色的起源。光学显微镜和扫描微光谱学揭示了存在覆盖象鼻虫整个外骨骼的微米大小的红色、黄色、绿色和蓝色反射像素。扫描电子显微镜结合聚焦离子束铣削表明，每个微像素由基于金刚石的光子晶体结构组成，不同的反射颜色是光子晶体不同取向的结果。混色分析用于研究反射微像素的集体行为。确定反射光子晶体微像素的点彩派、加色混色方案是象鼻虫明亮且近角无关的黄绿色的起源。
