The role of random nanostructures for the omnidirectional anti-reflection properties of the glasswing butterfly
The role of random nanostructures for the omnidirectional anti-reflection properties of the glasswing butterfly
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DOI：
10.1038/ncomms7909
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发表时间：
2015-04-01
影响因子：
16.6
通讯作者：
Hoelscher, Hendrik
中科院分区：
文献类型：
--
作者：
Siddique, Radwanul Hasan;Gomard, Guillaume;Hoelscher, Hendrik
顾名思义，玻璃翅蝴蝶 (Greta oto) 拥有透明的翅膀，即使在 80 度的大视角下，整个可见光谱范围内的雾度和反射率也非常低。这种全向抗反射行为是由覆盖其机翼透明区域的小纳米柱引起的。与自然界中发现的其他抗反射涂层不同，这些柱子排列不规则，具有随机的高度和宽度分布。在这里，我们用有效介质理论和传输矩阵方法模拟光学特性，结果表明，柱的随机高度分布不仅显着降低了法向入射的反射，而且还显着降低了高视角的反射。
The glasswing butterfly (Greta oto) has, as its name suggests, transparent wings with remarkable low haze and reflectance over the whole visible spectral range even for large view angles of 80 degrees. This omnidirectional anti-reflection behaviour is caused by small nanopillars covering the transparent regions of its wings. In difference to other anti-reflection coatings found in nature, these pillars are irregularly arranged and feature a random height and width distribution. Here we simulate the optical properties with the effective medium theory and transfer matrix method and show that the random height distribution of pillars significantly reduces the reflection not only for normal incidence but also for high view angles.