Dispersion and transitions of dipolar plasmon modes in graded plasmonic waveguides
Dispersion and transitions of dipolar plasmon modes in graded plasmonic waveguides
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DOI：
10.1063/1.2396905
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发表时间：
2006-10
影响因子：
4
通讯作者：
J. Xiao;K. Yakubo;K. Yu
中科院分区：
文献类型：
--
作者：
J. Xiao;K. Yakubo;K. Yu
研究了梯度等离子体波导中耦合等离子体模式，该波导是嵌入在折射率逐渐变化的介质中的金属纳米粒子的周期链。根据不同的局域化，作者确定了三种类型的局域化模式，即“轻”、“重”和“轻-重”通带外的等离子体能级。当粒子间距离d小于临界直流时，扩展模态和局域模态发生了不同的跃迁，而对于d>直流，没有扩展模态，则出现了三种局域模态。这些转变可以用为无损金属体系构造的相图来解释。
Coupled plasmon modes are studied in graded plasmonic waveguides, which are periodic chains of metallic nanoparticles embedded in a host with gradually varying refractive indices. The authors identify three types of localized modes called “light,” “heavy,” and “light-heavy” plasmonic gradons outside the passband, according to various localizations. The authors also demonstrate different transitions among extended and localized modes when the interparticle separation d is smaller than a critical dc, whereas the three types of localized modes occur for d>dc, with no extended modes. The transitions can be explained with phase diagrams constructed for the lossless metallic systems.