Hertzian plasmonic nanodimer as an efficient optical nanoantenna
Hertzian plasmonic nanodimer as an efficient optical nanoantenna
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DOI：
10.1103/physrevb.78.195111
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发表时间：
2008-11-01
影响因子：
3.7
通讯作者：
Engheta, Nader
中科院分区：
文献类型：
--
作者：
Alu, Andrea;Engheta, Nader
受经典射频辐射体赫兹偶极子的几何形状的启发，我们分析了一种等离子体光学二聚体纳米天线的设计。我们展示了如何操作一对紧密间隔的球形纳米粒子作为有效的光学纳米辐射器，以及如何通过设计放置在二聚体间隙的合适的纳米负载来极大程度地调整其调谐和匹配特性。在这个意义上，我们成功地应用了纳米电路的概念来模拟负载纳米颗粒。由于这种特殊的几何形状和设计，即使考虑到光学金属的真实吸收，也可以实现高水平的光学辐射效率。
Inspired by the geometry and shape of the classical radio-frequency radiator, the Hertzian dipole, here we analyze the design of a plasmonic optical dimer nanoantenna. We show how it may be possible to operate a pair of closely spaced spherical nanoparticles as an efficient optical nanoradiator, and how its tuning and matching properties may be tailored with great degree of freedom by designing suitable nanoloads placed at the dimer gap. In this sense, we successfully apply nanocircuit concepts to model the loading nanoparticles. High levels of optical radiation efficiency are achieved, even considering the realistic absorption of optical metals, thanks to this specific geometry and design.