Coherent excitation transport in metal-nanoparticle chains
Coherent excitation transport in metal-nanoparticle chains
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DOI：
10.1021/nl049679l
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发表时间：
2004-09-01
期刊：
影响因子：
10.8
通讯作者：
Citrin, DS
中科院分区：
文献类型：
--
作者：
Citrin, DS
在一个精确可解的模型中研究了非接触金属纳米颗粒链中的电磁能量传递。传输是由被限制在单个纳米颗粒内的等离子体之间的延迟电磁相互作用介导的，因此自一致地解释了与传输相同基础上的自发发射；链的传播混合等离子体-电磁模式被称为等离子体极化子。当激发波长大于谐振光波长时，在第一布里渊区发现暗模式，表明有可能抑制辐射损失。最近邻紧约束模型的有效性有限。
Electromagnetic energy transport in chains of noncontacting metal nanoparticles is studied within an exactly solvable model. The transport is mediated by the retarded electromagnetic interactions between plasmons confined to the individual nanoparticles and therefore self-consistently accounts for spontaneous emission on the same footing as the transport; the propagating hybrid plasmonic-electromagnetic modes of the chain are known as plasmon polaritons. Dark modes are found in the first Brillouin zone when the excitation wavelength is greater than the resonant optical wavelength, suggesting the possibility of the suppression of radiative losses. Nearest-neighbor tight-binding models are shown to be of limited validity.