Abstract
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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Funding
This work is supported by the National Natural Science Foundation of China (No. 51903094) and the Science and Technology Program of Guangzhou (No. 2019050001). The work is also partially supported by the National Key R&D Program of China (No. 2016YFB0401502), Program of Chang Jiang Scholars and Innovative Research Teams in Universities (No. IRT 17R40), Guangdong Provincial Laboratory of the Optical Information Materials and Technology (No. 2017B030301007), 111 project and Yunnan expert workstation (2017IC011).
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Zhou, H., Xu, Z., Zhou, G. et al. Optical modeling of cellulose nanofibril self-assembled thin film with iridescence. Colloid Polym Sci 299, 1139–1145 (2021). https://doi.org/10.1007/s00396-021-04834-5
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DOI: https://doi.org/10.1007/s00396-021-04834-5