An Analytic Model for the Dielectric Function of Au, Ag, and their Alloys
An Analytic Model for the Dielectric Function of Au, Ag, and their Alloys
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DOI：
10.1002/adom.201300457
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发表时间：
2014-02-01
影响因子：
9
通讯作者：
Meunier, Michel
中科院分区：
文献类型：
--
作者：
Rioux, David;Vallieres, Simon;Meunier, Michel
建立了一种预测金银合金介电性能的解析模型。这种多参数模型是对通常的德鲁德-洛伦兹模型的修正，考虑了金属的能带结构。利用遗传算法拟合不同金银比合金薄膜的介电函数。通过将纳米合金的实验消光光谱与Mie理论预测的消光光谱进行比较，验证了该模型适用于任意合金成分。
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.