Journal
OPTICS EXPRESS
Volume 22, Issue 20, Pages 24516-24529Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.024516
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Funding
- State Committee of Science of Ministry of Education and Science of the Republic of Armenia [SCS - 13-1C353]
- VolkswagenStiftung Grant [86933]
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Under certain conditions of the incident light polarization direction a Fano resonance arises in small gold nanorods arranged in a H-like configuration. This stems from the coupling between a bright dipole plasmon mode excited in the horizontal rod and dark quadrupole plasmon modes in both vertical rods. We investigate these surface plasmon modes, and analyze the dependence of the Fano resonance on the geometry parameters such as rod size and interparticle separation, and refractive index of embedding medium. To describe the degree of this energy transfer, we introduce a new parameter: the Fano resonance efficiency. We calculate absorption cross-sections for visible and NIR spectrum in each element of the structure, and near-field distributions at different wavelengths. We show that Fano resonance in small H-like structures exhibits high sensitivity with respect to the refractive index of the host medium, outperforming the values for larger plasmonic structures based on nanorods already investigated. (C) 2014 Optical Society of America
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