Journal
NANO LETTERS
Volume 12, Issue 1, Pages 364-369Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl203641z
Keywords
Magnetic plasmons; oligomers; coupling; Fano resonances; organic chemistry
Categories
Funding
- Robert A. Welch Foundation [C-1220, C-1222]
- Air Force Office of Scientific Research [FA9550-10-1-0469]
- Office of Naval Research [N00014-10-1-0989]
- National Science Foundation (IGERT) [DGE-0504425]
- DoD NSSEFF [N00244-09-1-0067]
- Defense Threat Reduction Agency (DTRA) [HDTRA1-11-1-0040]
- DFG
- BMBF
- BW Stiftung (Kompetenznetz Funktionelle Nanostrukturen)
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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 antiferromagnetic behavior in multiple repeated heptamer structures, supporting the propagation of low-loss magnetic plasmons in this new waveguide geometry.
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