Optical response of a hematite coating: ellipsometry data versus Fourier-based computations

Abstract : The optical properties of a hematite-epoxy coating are predicted numerically and compared with el-lipsometry measurements. The highly-heterogeneous dispersion of nanocubic hematite particles in the epoxy resin is simulated using a previously developed two-scales random model. The local anisotropic permittivity tensor of hematite particles, and that of the epoxy, are estimated by ellipsometry measurements carried out on a macroscopic hematite and epoxy samples. Fourier-based methods using a "discrete" Green operator are used to treat complex permittivities. They predict the effective and local electric displacement field in the quasi-static approximation. The former is close to two estimates based on the Hashin-Shtrikman bounds and a self-consistent approximation. Good agreement is found between experimental data and FFT computations in the whole range of the visible spectrum.
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Enguerrand Couka, François Willot, Patrick Callet, Dominique Jeulin. Optical response of a hematite coating: ellipsometry data versus Fourier-based computations. Advanced Science, Engineering and Medicine, American Scientific Publishers, 2015, 7 (11), pp.925-931. 〈http://www.ingentaconnect.com/content/asp/asem/2015/00000007/00000011/art00001?token=004b1acd357f6ed3e2405847447b49766c7a73516f356b655d483375686f230a0c50577bd77〉. 〈10.1166/asem.2015.1790〉. 〈hal-01232497〉

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