Influence of disorders on the optical properties of butterfly wing: Analysis with a finite-difference time-domain method
Influence of disorders on the optical properties of butterfly wing: Analysis with a finite-difference time-domain method
复制标题
紊乱对蝴蝶翅膀光学特性的影响：时域有限差分法分析
DOI：
10.1140/epjb/e2013-40543-y
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发表时间：
2013-11-13
影响因子：
1.6
通讯作者：
Zhang, Di
中科院分区：
文献类型：
--
作者：
Chen, Yu;Dai, Guozhang;Zhang, Di
许多蝴蝶翅膀鳞片（BWS）具有新颖的周期性精细结构，可以通过类似于光子晶体中的相互作用影响和操纵特定波长范围内的光的传播。这种光学性质及其物理根源可以通过求解麦克斯韦方程组进行理论分析。以往的许多工作已经成功地将严格周期性的松树结构模型应用于背散射体的散射特性分析。然而，周期性的波动是常见的BWS的结构。因此，澄清的影响的大小或周期性的变化对BWS的光学性能是必要的。在这篇文章中，尺寸的变化已经被考虑和它们对BWS的散射特性的影响进行了详细的模拟，使用时域有限差分法（FDTD）。在考虑由尺寸或周期性变化引起的紊乱的情况下，计算的反射光谱将更具有代表性。详细分析表明，当入射角限制在0° ± 10°（−10° ≤θ≤ 10°）范围内时，主反射峰将发生展宽和红移。如果最大偏差-松树单元远离其原始平衡位置-小于50 nm，则结果将是稳定的。最后，我们对蝶形闪蝶的可见光谱进行了测试，并与我们的模拟结果进行了比较。结果表明，目前的结果与实验观察到的趋势是一致的，这项工作将有助于更好地理解材料的着色机制与BWS的结构。
Many butterfly wing scales (BWSs) possess novel periodic fine structures and can influence and manipulate the propagation of light in a certain wavelength range though an interaction similar to that occurring in photonic crystals. Such optical properties and their physical origin can be theoretically analysed by solving Maxwell’s equations. Many previous works have successfully applied a model of strict periodic pine-tree structure to the analysis of the scattering property of BWSs. However, fluctuation of the periodicity is common in the structure of BWSs. Thus clarification of the influence of size or periodicity variations on the optical properties of BWSs is then needed. In the present article, size variations have been considered and their influence on the scattering properties of BWSs is simulated in detail using a Finite-Difference-Time-Domain method (FDTD). The calculated reflectance spectrum will be more representative to the experimental result in the case where disorders, caused by size or periodicity variations, are considered. A detailed analysis shows that the main reflectance peak will be broadened and red-shifted especially when the angle of incidence is confined to a narrow range within 0° ± 10° (−10° ≤θ≤ 10°). The results will be stable if the maximal deviation – the pine-tree unit away from its original equilibrium position – is smaller than 50 nm. Finally, we test the visible spectrum of the butterflyMorpho Didiusand compare the results to those of our simulation. It is shown that the present results are in good agreement with experimentally observed trends, and this work will be helpful for a better understanding of the colorisation mechanism of materials with the structure of BWSs.