An Analytic Model for the Dielectric Function of Au, Ag, and their Alloys

被引：243

作者：

Rioux, David ^{[1
]}

Vallieres, Simon ^{[1
]}

Besner, Sebastien ^{[1
]}

Munoz, Philip ^{[2
]}

Mazur, Eric ^{[2
]}

Meunier, Michel ^{[1
]}

机构：

[1] Ecole Polytech, Dept Engn Phys, Laser Proc & Plasmon Lab, Montreal, PQ H3C 3A7, Canada

[2] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA

来源：

ADVANCED OPTICAL MATERIALS | 2014年 / 2卷 / 02期

基金：

加拿大自然科学与工程研究理事会;

关键词：

dielectric functions; gold-silver alloys; analytic models; plasmonics; nanoparticles; OPTICAL-CONSTANTS; NANOPARTICLES; THERAPY; REGION;

D O I：

10.1002/adom.201300457

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：176 / 182

页数：7

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