论文标题
圆柱纳米颗粒和二聚体中的等离子体模式
Plasmonic modes in cylindrical nanoparticles and dimers
论文作者
论文摘要
我们介绍了对准近似值内圆柱纳米颗粒中托管的等离激元模式的共振频率的分析表达式。我们的理论模型使我们能够使用具有任意纵横比的金属圆柱体的纵向和横向极化的偶极模式，这使我们能够捕获等离子纳米线和纳米线的物理。由于溢出效应，我们还将量子机械校正计算为这些共振频率，这与具有纳米尺寸的圆柱体相关。我们继续考虑在圆柱纳米颗粒的二聚体中局部表面等离子体的偶联，从而导致集体等离子激发。我们扩展了理论形式主义以构建二聚体的分析模型，描述了所得明亮和深色集体模式的纳米粒子间隔的演变。我们评论由于溢出效应而导致的耦合模式频率的重新归一化，并讨论了一些实验检测方法。
We present analytical expressions for the resonance frequencies of the plasmonic modes hosted in a cylindrical nanoparticle within the quasistatic approximation. Our theoretical model gives us access to both the longitudinally and transversally polarized dipolar modes for a metallic cylinder with an arbitrary aspect ratio, which allows us to capture the physics of both plasmonic nanodisks and nanowires. We also calculate quantum mechanical corrections to these resonance frequencies due to the spill-out effect, which is of relevance for cylinders with nanometric dimensions. We go on to consider the coupling of localized surface plasmons in a dimer of cylindrical nanoparticles, which leads to collective plasmonic excitations. We extend our theoretical formalism to construct an analytical model of the dimer, describing the evolution with the inter-nanoparticle separation of the resultant bright and dark collective modes. We comment on the renormalization of the coupled mode frequencies due to the spill-out effect, and discuss some methods of experimental detection.
