Department of Physics, KAIST, 335 Gwahangno, Yuseong-Gu, Daejeon, Rep. of Korea.
Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW, Cambridge, United Kingdom.
Sci Rep. 2017 Apr 7;7:46023. doi: 10.1038/srep46023.
The scales of Morpho butterflies are covered with intricate, hierarchical ridge structures that produce a bright, blue reflection that remains stable across wide viewing angles. This effect has been researched extensively, and much understanding has been achieved using modeling that has focused on the positional disorder among the identical, multilayered ridges as the critical factor for producing angular independent color. Realizing such positional disorder of identical nanostructures is difficult, which in turn has limited experimental verification of different physical mechanisms that have been proposed. In this paper, we suggest an alternative model of inter-structural disorder that can achieve the same broad-angle color reflection, and is applicable to wafer-scale fabrication using conventional thin film technologies. Fabrication of a thin film that produces pure, stable blue across a viewing angle of more than 120 ° is demonstrated, together with a robust, conformal color coating.
闪蝶的鳞片表面覆盖着错综复杂的、分层的脊状结构，这些脊状结构产生了明亮、稳定的蓝色反射，这种效果在广泛的观察角度下都能保持稳定。这种效果已经被广泛研究，通过建模可以很好地理解这一现象，建模的重点是相同的多层脊状结构之间的位置无序性，因为这是产生角度独立颜色的关键因素。实现相同的纳米结构的位置无序性是困难的，这反过来又限制了对不同物理机制的实验验证，这些物理机制已经被提出。在本文中，我们提出了一种结构间无序的替代模型，该模型可以实现相同的宽角颜色反射，并且可以使用传统的薄膜技术在晶圆级制造中应用。我们展示了一种薄膜的制造，该薄膜在超过 120°的观察角度下产生纯、稳定的蓝色，同时具有坚固、一致的颜色涂层。
