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arXiv 1502.00264physics.optics
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超背散射纳米颗粒二聚体

Superbackscattering Nanoparticle Dimers

Iñigo Liberal, Iñigo Ederra, Ramón Gonzalo, Richard. W. Ziolkoski

摘要:

介绍了超背散射纳米粒子二聚体的理论和设计。我们解析地推导出了最佳配置及其后向散射截面的上界。特别是,它表明,电小的纳米粒子二聚体可以增强背散射的6.25倍,相对于单偶极粒子。我们证明,接近这个理论极限的最佳设计可以通过使用一个简单的电路模型。对基于等离子体和高介电常数粒子的实际实现的研究表明,即使有实际的损耗,也可能实现四倍的增强因子。

英文摘要:

The theory and design of superbackscattering nanoparticle dimers are presented. We analytically derive the optimal configurations and the upper bound of their backscattering cross-sections. In particular, it is demonstrated that electrically small nanoparticle dimers can enhance the backscattering by a factor of 6.25 with respect to single dipolar particles. We demonstrate that optimal designs approaching this theoretical limit can be found by using a simple circuit model. The study of practical implementations based on plasmonic and high-permittivity particles reveal that fourfold enhancement factors might be attainable even with realistic losses.

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