Nanostructure-induced structural coloration and bio-invisibility are important for camouflaging as it displays color and can be tuned and imparted in a more environmentally friendly manner. However, even though many new camouflage fabrics and technologies are invented, there is a lack of numerical electromagnetic and optical approaches to analyze the phenomenon of light scattering of camouflaging materials from nanostructures. In this study, we built and presented a successful simulation of physical coloration caused by multilayer membrane interference. We created this model based on surfactant-like cellulose nanofibrils (CNFs) that tightly stacked into photon-active microstructure and surface topology for light reflection, thus affecting the film gloss. Incident light coming at a defined wavelength or angle was studied. The effects of film height, high microstructure, and curvature on the optical properties of ITO/PET substrates were investigated. These showed the coloration is highly dependent on the nanostructure’s characteristics. This study provides a general prediction model to deal with optical multilayer systems where interference plays a vital role in optical camouflaging, etc.

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中文翻译：

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纤维素纳米原纤维自组装薄膜的光学建模

纳米结构引起的结构着色和生物不可见性对于伪装很重要，因为它显示颜色并且可以以更环保的方式进行调整和赋予。然而，即使发明了许多新的伪装织物和技术，也缺少数值电磁和光学方法来分析伪装材料从纳米结构的光散射现象。在这项研究中，我们建立并提出了由多层膜干扰引起的物理着色的成功模拟。我们基于类似表面活性剂的纤维素纳米原纤维（CNF）创建了该模型，该纤维紧密堆叠成光子活性的微结构和表面拓扑结构以进行光反射，从而影响了膜的光泽度。研究了以定义的波长或角度入射的入射光。胶片高度的影响 研究了ITO / PET基板的高微观结构和曲率对光学性能的影响。这些表明颜色高度依赖于纳米结构的特性。这项研究为处理光学多层系统提供了一个通用的预测模型，其中干涉在光学伪装等方面起着至关重要的作用。

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