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. 2017 Dec 15;7:17622. doi: 10.1038/s41598-017-17914-w

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Light scattering properties of photonic structures. The principal setup for spectral measurement of the coloration depending on the observer’s angle is illustrated in (A). A sample was illuminated at 45° and reflection spectra were measured at different angles. (B) The normalized to their area reflection spectra are shown at different observation angles. Upright light microscopy images (C) at different sample tilt angles were obtained using a microscope color camera. The simulation results of reflection spectra for the artificial photonic structure using two different approaches is illustrated in (D). A specular reflection for multilayer system consisting of 5 layers of the polymer separated by air layers is shown by solid line. Rayleigh scattering on multiple subwavelength centers is shown by dot/dash-line. Furthermore, the dash-line represents the specular reflection of the real photonic structure.