Power-Law/Exponential Transport of Electromagnetic Field in One-Dimensional Metallic Nanoparticle Arrays
Power-Law/Exponential Transport of Electromagnetic Field in One-Dimensional Metallic Nanoparticle Arrays
复制标题
一维金属纳米粒子阵列中电磁场的幂律/指数输运
DOI：
10.1007/s11468-018-0763-x
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发表时间：
2018-12-01
期刊：
影响因子：
3
通讯作者：
Zhang, Wei
中科院分区：
文献类型：
--
作者：
Song, Gang;Zhang, Wei
基于偶极子耦合分析和时域有限差分模拟，研究了一维金属纳米颗粒（NP）链中表面等离子体的传播。我们的系统研究表明，局域等离子激元激发与晶格集体行为之间的相互作用导致了具有不同电磁场输运性质的两个相（I和II）。在阶段1中，电磁场衰减遵循幂律。在阶段II中，电磁场在近距离区域表现为指数衰减，在远距离区域表现为幂律衰减。此外，还发现了在长传播距离下的普遍幂律指数。不同的电磁场传播行为（不同指数的幂律衰减，不同传播长度的指数衰减）可以通过调整激发场的参数（波长、极化）和/或NP链的参数来相互转换。我们所发现的电磁场输运机制对于设计具有强场约束和高效场/能量传递的等离子体波导非常有用，在集成纳米光子电路中具有重要的应用。
Based on the coupled-dipole analysis and finite-difference time-domain simulation, we have investigated the surface plasmon propagation in one-dimensional metallic nanoparticle (NP) chains. Our systematic studies reveal that the interplay between the localized plasmon excitation and the lattice collective behavior leads to two phases (I and II) of different electromagnetic (EM) field transport properties. In phase I, the EM field decays follow thepower-law. In phase II, the EM field shows theexponential decayin the short-distance regime and thepower-law decayin the long-distance regime. Moreover, universal power-law exponents have been found in the long propagation distance. Different EM field propagation behaviors (power-law decay with different exponents, exponential decay with different propagation length) can be transformed to each other by tuning the parameters of the excitation fields (wavelength, polarization) and/or those of the NP chains. The EM field transport mechanisms we have found are very useful in the design of plasmonic waveguide with both strong field confinement and efficient field/energy transfer, which has important applications in integrated nanophotonic circuits.