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arXiv 1202.4413cond-mat.mtrl-sciphysics.optics
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随机等离子体复合材料的有效介电常数

Effective permittivity of random plasmonic composites

Satvik N. Wani, Ashok S. Sangani, Radhakrishna Sureshkumar

摘要:

提出了一种有效介质理论(EMT),用于预测高导光率金属(如Ag、Au和Cu)的密集随机色散的有效介电常数ε eff。研究了ε eff与颗粒体积分数ε、静态结构因子κ和颗粒半径a的关系。在静电极限下,κ的上界和下界分别对应于Maxwell-Garnett和Bruggeman EMT。有限尺寸效应在以下情况下是显著的:|β^2(ka/n)^3|其中β、k和n分别表示纳米颗粒的极化率、波数和基质折射率。粒子与有效介质之间的耦合导致共振峰红移,ε eff对ε的非线性依赖,以及ε eff的Fano共振。

英文摘要:

An effective-medium theory (EMT) is developed to predict the effective permittivity ε_eff of dense random dispersions of high optical-conductivity metals such as Ag, Au and Cu. Dependence of ε_eff on the volume fraction ϕ, a microstructure parameter κrelated to the static structure factor and particle radius a is studied. In the electrostatic limit, the upper and lower bounds of κcorrespond to Maxwell-Garnett and Bruggeman EMTs respectively. Finite size effects are significant when |β^2(ka/n)^3| becomes O(1) where β, k, and n denote the nanoparticle polarizability, wavenumber and matrix refractive index respectively. The coupling between the particle and effective medium results in a red-shift in the resonance peak, a non-linear dependence of ε_eff on ϕ, and Fano resonance in ε_eff.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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