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Influence of the tip in near-field imaging of nanoparticle plasmonic modes: Weak and strong coupling regimes

AuthorsGarcía-Etxarri, Aitzol ; Romero, Isabel; García de Abajo, Francisco Javier ; Hillenbrand, Rainer; Aizpurua, Javier
Issue Date2009
PublisherAmerican Physical Society
CitationPhysical Review B - Condensed Matter and Materials Physics 79(12):125439 (2009)
AbstractWe identify weak and strong coupling regimes between a near-field probing tip and a plasmonic sample by imaging plasmon-resonant gold nanodisks with scattering-type scanning near-field optical microscopy (s-SNOM). By means of rigorous electrodynamical calculations based on a model system, we find that in the weak coupling regime, s-SNOM can be applied for direct mapping of plasmonic nanoantenna modes, while in the strong coupling regime, the near-field probe allows for high-precision opto-mechanical control of the antenna response. © 2009 The American Physical Society.
Identifiersdoi: 10.1103/PhysRevB.79.125439
issn: 1098-0121
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