Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3437093
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Funding
- Nanoantenna collaborative European project [HEALTH-F5-2009-241818]
- DAAD
- Partenariat Hubert Curien Procope Program
- Egide Organisation
- Conseil Regional de Champagne Ardenne
- Heidelberg Graduate School of Fundamental Physics
- FRONTIER
- Spanish Ministry of Innovation and Science [FIS2007-66711-C02-01]
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We report on the observation of second-order infrared (IR) plasmon resonances in lithographically prepared gold nanorods investigated by means of far-field microscopic IR spectroscopy. In addition to the fundamental antennalike mode, even and odd higher order resonances are observed under normal incidence of light. The activation of even-order modes under normal incidence is surprising since even orders are dipole-forbidden because of their centrosymmetric charge density oscillation. Performing atomic force microscopy and calculations with the boundary element method, we determine that excitation of even modes is enabled by symmetry breaking by structural deviations of the rods from an ideal, straight shape. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3437093]
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