Fitting the optical constants of gold, silver, chromium, titanium, and aluminum in the visible bandwidth

Dominique Barchiesi 1, 2, * Thomas Grosges 2, 1
* Auteur correspondant
2 Gamma3 - Automatic mesh generation and advanced methods
Inria Paris-Rocquencourt, UTT - Université de Technologie de Troyes
Abstract : The fitting of metal optical properties is a topic that has applications in advanced simulations of spectroscopy, plasmonics, and optical engineering. In particular, the finite difference time domain method (FDTD) requires an analytical model of dispersion that verifies specific conditions to produce a full spectrum in a single run. Combination of Drude and Lorentz models, and Drude and critical points models, are known to be efficient, but the number of parameters to be adjusted for fitting data can prevent accurate results from simulated annealing or Nelder-Mead. The complex number relative permittivities of Au, Ag, Al, Cr, and Ti from either Palik or Johnson and Christy experimental data in the visible domain of wavelengths are successfully fitted by using the result of the particle swarm optimization method with FDTD constraint, as a starting point for the Nelder-Mead method. The results are well positioned compared to those that can be found in the literature. The results can be used directly for numerical simulations in the visible domain. The method can be applied to other materials, such as dielectrics, and to other domain of wavelengths.
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Contributeur : Thomas Grosges <>
Soumis le : lundi 27 janvier 2014 - 10:44:37
Dernière modification le : vendredi 25 mai 2018 - 12:02:06

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Dominique Barchiesi, Thomas Grosges. Fitting the optical constants of gold, silver, chromium, titanium, and aluminum in the visible bandwidth. Journal of Nanophotonics, Society of Photo-optical Instrumentation Engineers, 2014, 8 (1), pp.083097--083097. 〈10.1117/1.JNP.8.083097〉. 〈hal-00936659〉



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