Near-field-induced tunability of surface plasmon polaritons in composite metallic nanostructures
Near-field-induced tunability of surface plasmon polaritons in composite metallic nanostructures
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DOI：
10.1111/j.1365-2818.2008.01911.x
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发表时间：
2008-02-01
影响因子：
2
通讯作者：
Tikhodeev, S. G.
中科院分区：
文献类型：
--
作者：
Christ, A.;Leveque, G.;Tikhodeev, S. G.
我们对基于金属纳米线的复合纳米结构中的近场感应耦合效应进行了数值研究。我们的多层系统由支持光学波长的局域粒子等离子体激元的单个金纳米线和支持离域表面等离子体激元的空间分离的均匀银板组成。我们表明，通过改变附近金属板的厚度，可以在大光谱范围内控制复合结构的局域等离激元模式，形成所谓的磁性原子。比较了单线金属结构和基于阵列的金属结构的光学响应。证明了由于线镜相互作用以及磁性光子晶体中局域和离域表面等离子体激元模式之间的耦合而引起的光谱变化。所呈现的效果对于金属基纳米器件的优化非常重要，并且可能导致具有新颖等离子体功能的超材料的实现。
We numerically study near-field-induced coupling effects in metal nanowire-based composite nanostructures. Our multi-layer system is composed of individual gold nanowires supporting localized particle plasmons at optical wavelengths, and a spatially separated homogeneous silver slab supporting delocalized surface plasmons. We show that the localized plasmon modes of the composite structure, forming so-called magnetic atoms, can be controlled over a large spectral range by changing the thickness of the nearby metal slab. The optical response of single-wire and array-based metallic structures are compared. Spectral shifts due to wire-mirror interaction as well as the coupling between localized and delocalized surface plasmon modes in a magnetic photonic crystal are demonstrated. The presented effects are important for the optimization of metal-based nanodevices and may lead to the realization of metamaterials with novel plasmonic functionalities.