Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China.
Opt Lett. 2011 May 1;36(9):1542-4. doi: 10.1364/OL.36.001542.
We theoretically investigate the plasmon coupling in metallic nanorod dimers. A pronounced dip is found in the extinction spectrum due to plasmonic Fano resonance, which is induced by destructive interference between the bright dipole plasmon of a short nanorod and the dark quadrupole plasmon of a long nanorod. This Fano interference can also be explained as the coupling between the bright and dark modes both supported by the whole dimer. The Fano resonance can be tuned by adjusting the spatial or spectral separation between two nanorods in the dimer.
我们从理论上研究了金属纳米棒二聚体中的等离子体耦合。由于短纳米棒的亮偶极等离子体和长纳米棒的暗四极等离子体之间的相消干涉，在消光谱中发现了明显的尖峰，这归因于等离子体 Fano 共振。这种 Fano 干涉也可以解释为整个二聚体支持的亮模和暗模之间的耦合。通过调整二聚体中两个纳米棒之间的空间或光谱分离，可以调节 Fano 共振。
