Journal
ACS NANO
Volume 6, Issue 7, Pages 6462-6470Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn3021579
Keywords
plasmon; nanoantenna; asymmetric dimer; Fano resonance; nonlinear response; figure of merit
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Funding
- European Science Foundation
- ETORTEK from the Basque Government
- Spanish Ministry of Innovation and Science [FIS2007-66711-C01-01]
- EPSRC [EP/J010758/1]
- Engineering and Physical Sciences Research Council [EP/J011797/1, EP/H019669/1] Funding Source: researchfish
- EPSRC [EP/J011797/1, EP/H019669/1] Funding Source: UKRI
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We investigate theoretically and experimentally the structure of plasmonic modes in individual asymmetric dimer antennas. Plasmonic near-field coupling of high-order modes results in hybridization of bright and dark modes of the individual nanorods, leading to an anticrossing of the coupled resonances. For two bright modes, hybridization results in a capacitive red shift and super-radiant broadening. We show that the properties of asymmetric dimers can be used for nonlinear control of spectral modes and demonstrate such a nonlinear effect by measuring the modulation of a hybrid asymmetric dimer-ITO antenna. With use of full electrodynamical calculations, we find that the properties of the near-field nonlinear responses are distinctly different from the far-field, which opens up new routes for nonlinear control of plasmonic nanosystems.
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