Transformation optics description of touching metal nanospheres

A. I. Fernandez-Dominguez; S. A. Maier; J. B. Pendry

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Transformation optics description of touching metal nanospheres

机译：接触金属纳米球的转换光学描述

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We present an insightful theoretical description of the optical properties of touching metal nanospheres. Our approach, which exploits transformation optics ideas within the quasistatic approximation, yields simple expressions for all the relevant electromagnetic magnitudes in these singular nanoparticle geometries. We demonstrate the highly efficient collection and concentration of light featured by nanosphere dimers, and show the prominent field enhancement that takes place at the point of contact between a single nanoparticle and a flat metal surface. Our method evidences that surface plasmon modes play a key role in the broadband light harvesting capabilities of these nanostructures. The range of validity of our analytical results are explored through the comparison with numerical full electrodynamic simulations.

机译：我们提出了有见地的接触金属纳米球的光学特性的理论描述。我们的方法在准静态近似中利用了转换光学的思想，得出了这些奇异纳米粒子几何结构中所有相关电磁幅值的简单表达式。我们展示了纳米球二聚体所特有的高效光的收集和聚集，并展示了在单个纳米粒子与平坦金属表面之间的接触点发生的显着场增强。我们的方法证明表面等离子体激元模式在这些纳米结构的宽带光收集能力中起着关键作用。通过与数值全电动模拟进行比较，探索了我们的分析结果的有效性范围。

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来源
《Physical review》 |2012年第16期|p.165148.1-165148.13|共13页
作者
A. I. Fernandez-Dominguez; S. A. Maier; J. B. Pendry;
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作者单位

The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, United Kingdom;

The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, United Kingdom;

The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, United Kingdom;

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collective excitations (including excitons, polarons, plasmons and other charge-density excitations); wave propagation, transmission and absorption; optical materials; nanocrystals and nanoparticles;

机译：集体激发（包括激子;极化子;等离激元和其他电荷密度激发）;波的传播;传输和吸收;光学材料纳米晶体和纳米颗粒;

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Transformation optics description of touching metal nanospheres

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