Plasmon hybridization model generalized to conductively bridged nanoparticle dimers
Plasmon hybridization model generalized to conductively bridged nanoparticle dimers
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DOI：
10.1063/1.4817592
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发表时间：
2013-08-14
影响因子：
4.4
通讯作者：
Zhao, Ke
中科院分区：
文献类型：
--
作者：
Liu, Lifei;Wang, Yumin;Zhao, Ke
由桥接纳米颗粒二聚体的导电结引入的电荷转移可以对系统的光学特性产生显着影响。我们扩展了等离激元杂交模型，以包括导电结和电荷转移效应。从我们的模型中，我们能够推导出桥二聚体的所有等离激元共振，包括电荷转移等离激元（CTP），并预测当系统参数变化时它们的趋势。特别是，我们发现 CTP 是足够窄的单极模式与多极（包括偶极）模式相互作用的结果。电荷转移引起的屏蔽引起杂化键合二聚体模式的蓝移并降低结中的电场。我们的模型可以作为桥联纳米颗粒聚集体光学性质的重要指南。 (C) 2013 AIP 出版有限责任公司。
Charge transfer introduced by a conductive junction bridging a nanoparticle dimer can have a pronounced effect on the optical properties of the system. We have extended the plasmon hybridization model to include conductive junctions and charge transfer effects. From our model, we are able to derive all the plasmon resonances of the bridged dimer, including the charge transfer plasmon (CTP), and predict their trends when system parameters are varied. In particular, we find that CTP is a result of a sufficiently narrow monopole mode interacting with multipolar (including dipolar) modes. The screening arising from charge transfer induces a blueshift of the hybridized bonding dimer modes and decreases the electric field in the junction. Our model may serve as an important guide for optical properties of bridged nanoparticle aggregates. (C) 2013 AIP Publishing LLC.