Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States.
Nano Lett. 2011 Sep 14;11(9):3927-34. doi: 10.1021/nl202143j. Epub 2011 Aug 25.
Assemblies of strongly coupled plasmonic nanoparticles can support highly tunable electric and magnetic resonances in the visible spectrum. In this Letter, we theoretically demonstrate Fano-like interference effects between the fields radiated by the electric and magnetic modes of symmetric nanoparticle trimers. Breaking the symmetry of the trimer system leads to a strong interaction between the modes. The near and far-field electromagnetic properties of the broken symmetry trimer are tunable across a large spectral range. We exploit this Fano-like effect to demonstrate spatial and temporal control of the localized electromagnetic hotspots in the plasmonic trimer.
强耦合等离子体纳米粒子组装体可以在可见光范围内支持高度可调谐的电和磁共振。在这封信件中，我们理论上演示了对称纳米粒子三聚体的电和磁模式辐射场之间的类 Fano 干涉效应。打破三聚体系统的对称性会导致模式之间的强烈相互作用。不对称三聚体的近场和远场电磁特性在很大的光谱范围内可调谐。我们利用这种类 Fano 效应来演示等离子体三聚体中局部电磁热点的空间和时间控制。
