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. 2017 May 5;6(5):e16233. doi: 10.1038/lsa.2016.233

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Copyright © 2017 The Author(s)

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Optical properties of the network metamaterials: reflectivity spectra. (a) Experimental normal incidence reflectance spectra as a function of the Al₂O₃ coating thickness, d. (b–e) Experimental reflectance spectra of nanoporous PtYAl thin films coated with 18-, 28-, 45- and 53-nm Al₂O₃, respectively, as a function of the incidence angle (20°–85°). The value of reflectance is indicated by the color bar. (f) FDTD-calculated normal incidence reflectance spectra as function of the Al₂O₃ coating thickness, d.