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Interference, coupling, and nonlinear control of high-order modes in single asymmetric nanoantennas

AuthorsAbb, Martina; Albella, Pablo ; Aizpurua, Javier ; Muskens, Otto L.
KeywordsAsymmetric dimer
Fano resonance
Nonlinear response
Figure of merit
Issue Date2012
PublisherAmerican Chemical Society
CitationACS Nano 6(7): 6462-6470 (2012)
AbstractWe 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. © 2012 American Chemical Society.
Identifiersdoi: 10.1021/nn3021579
issn: 1936-0851
e-issn: 1936-086X
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