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An Analytic Model for the Dielectric Function of Au, Ag, and their Alloys
Author(s) -
Rioux David,
Vallières Simon,
Besner Sébastien,
Muñoz Philip,
Mazur Eric,
Meunier Michel
Publication year - 2014
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201300457
Subject(s) - materials science , alloy , dielectric , dielectric function , mie scattering , drude model , ellipsometry , spectral line , extinction (optical mineralogy) , condensed matter physics , parametric statistics , thin film , thermodynamics , optics , nanotechnology , composite material , optoelectronics , physics , quantum mechanics , light scattering , statistics , scattering , mathematics
An analytical model for the prediction of the dielectric properties of gold–silver alloys is developed. This multi‐parametric model is a modification of the usual Drude–Lorentz model that takes into account the band structure of the metals. It is fitted by a genetic algorithm to the dielectric function of thin alloy films of different gold–silver ratio obtained by ellipsometry. The model is validated for arbitrary alloy compositions by comparing the experimental extinction spectra of alloy nanoparticles with the spectra predicted by Mie theory.