Numerical Analysis on the Optical Role of Nano-Randomness on the Morpho Butterfly's Scale
Numerical Analysis on the Optical Role of Nano-Randomness on the Morpho Butterfly's Scale
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DOI：
10.1166/jnn.2011.3906
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发表时间：
2011-04-01
影响因子：
--
通讯作者：
Kuwahara, Yuji
中科院分区：
文献类型：
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作者：
Saito, Akira;Yonezawa, Masaru;Kuwahara, Yuji
闪蝶的蓝色具有非常低的角度依赖性，尽管颜色的产生是基于干涉效应的选定波长。研究表明，特定形态颜色产生的关键在于其尺度的随机性。利用时域有限差分法（FDTD）分析了Morph蝴蝶鳞片结构中各种随机性的作用，这是常规解析计算无法实现的。结果表明，入射光的非相干性起着至关重要的作用，这是不能实现的结构随机性。另一方面，横向和垂直的随机性，以及随机分量的数量被发现每个都有一个独立的作用，以实现特定的形态颜色，防止尖锐的反射角依赖性。通过数值模拟分析光学复杂随机结构所获得的方向不仅有助于理解科学原理，而且有助于设计人工材料的光学特性。
The blue coloration of Morpho butterflies has anomalously low angular dependence despite the production of color with a selected wavelength based on an interference effect. A key to the mechanism of the specific Morpho-color was suggested to be the randomness of its scale. Using finite-difference time-domain (FDTD) analysis, the role of different kinds of randomness in the structure of the Morph butterfly's scale was investigated, which was impossible by conventional analytical calculations. The results revealed that incoherence in the incident light plays an essential role, which cannot be realized only by structural randomness. On the other hand, the lateral and vertical randomness, and the number of random components were found each to have an independent role to realize the specific Morpho-color preventing the sharp reflective angular dependence. The direction obtained by the numerical simulations to analyze optically complex random structures will serve not only to understand the scientific principles, but also to design the optical properties of artificial materials.