Magnetic Plasmon Formation and Propagation in Artificial Aromatic Molecules
详细信息 查看全文
- 作者：Na Liu ; Shaunak Mukherjee ; Kui Bao ; Lisa V. Brown ; Jens Dorfm眉ller ; Peter Nordlander ; Naomi J. Halas
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：January 11, 2012
- 年：2012
- 卷：12
- 期：1
- 页码：364-369
- 全文大小：421K
- 年卷期：v.12,no.1(January 11, 2012)
- ISSN：1530-6992
文摘
The plasmonic properties of coupled metallic nanostructures are understood through the analogy between their collective plasmon modes and the electronic orbitals of corresponding molecules. Here we expand this analogy to planar arrangements of plasmonic nanostructures whose magnetic plasmons directly resemble the delocalized orbitals of aromatic hydrocarbon molecules. The heptamer structure serves as a benzene-like building block for a family of plasmonic artificial aromatic analogs with fused ring structures. Antiphase magnetic plasmons are excited in adjacent fused heptamer units, which for a linear multiheptamer structure is a behavior controlled by the number of units in the structure. This antiphase coupling gives rise to plasmonic 鈥渁ntiferromagnetic鈥?behavior in multiple repeated heptamer structures, supporting the propagation of low-loss magnetic plasmons in this new waveguide geometry.