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. 2018 Apr 3;8:5438. doi: 10.1038/s41598-018-23771-y

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© The Author(s) 2018

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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(a) Optical reflectance spectra of AR sub-wavelength structured samples. (Curves a-e represent imprinting forces of 350, 250, 200, 150 and 100 N; curve f represents the flat UV-curable resin coated PC substrate); (b) Optical reflectance spectra of samples with different parameters (imprinting force and resin viscosity). (Curves a-d represent parameters of (a) 350 N, 100 cps; (b) 250 N, 100 cps; (c) 250 N, 400 cps; and (d) 250 N, 800 cps, curve e represents the flat UV-curable resin coated PC substrate); (c) Measured angle-dependent reflectance at different incidence angles. (Curves a-e represent incidence angles of 0°, 30°, 50°, 60°, and 75°); (d) Photographs of half side AR sub-wavelength structured samples exposed to conventional room illumination. Characters are visible only under the (i) left and (ii) right half, since they are cover with AR structures; (e) Water contact angles of (i) bare PC substrate, (ii) flat UV-curable resin coated PC substrate, and (iii) AR sub-wavelength structured sample fabricated with an imprinting force of 350 N and a resin viscosity of 100 cps (sample 4 in Table 1).