等离子体低聚物中从孤立模式到集体模式的转变。

Transition from isolated to collective modes in plasmonic oligomers.

机构信息

4. Physikalisches Institut and Research Center Scope, Universitat Stuttgart, Stuttgart, Germany.

出版信息

Nano Lett. 2010 Jul 14;10(7):2721-6. doi: 10.1021/nl101938p.

DOI:10.1021/nl101938p

PMID:20586409

Abstract

We demonstrate the transition from isolated to collective optical modes in plasmonic oligomers. Specifically, we investigate the resonant behavior of planar plasmonic hexamers and heptamers with gradually decreasing the interparticle gap separation. A pronounced Fano resonance is observed in the plasmonic heptamer for separations smaller than 60 nm. The spectral characteristics change drastically upon removal of the central nanoparticle. Our work paves the road toward complex hierarchical plasmonic oligomers with tailored optical properties.

摘要

我们展示了等离子体低聚物中从孤立到集体光学模式的转变。具体来说，我们研究了随着粒子间间隙逐渐减小，平面等离子体六聚体和七聚体的共振行为。在小于 60nm 的分离距离下，在等离子体七聚体中观察到明显的 Fano 共振。当移除中心纳米粒子时，光谱特性会发生剧烈变化。我们的工作为具有定制光学特性的复杂分层等离子体低聚物铺平了道路。