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We revisit plasmonic modes in nanoparticle dimers with conductive orinsulating junction resulting in conductive or capacitive coupling. In ourstudy which combines electron energy loss spectroscopy, optical spectroscopy,and numerical simulations, we show coexistence of strongly and weaklyhybridized modes. While the properties of the former ones strongly depend onthe nature of the junction, the properties of the latter ones are nearlyunaffected. This opens up a prospect for independent engineering of differentplasmonic modes in a single plasmonic antenna. In addition, we show thatBabinet's principle allows to engineer the near field of plasmonic modesindependent of their energy. Finally, we demonstrate that combined electronenergy loss imaging of a plasmonic antenna and its Babinet-complementarycounterpart allows to reconstruct the distribution of both electric andmagnetic near fields of localised plasmonic resonances supported by the antennaas well as charge and current antinodes of related charge oscillations.

Independent engineering of individual plasmon modes in plasmonic dimers with conductive and capacitive coupling