  We revisit plasmonic modes in nanoparticle dimers with conductive or
insulating junction resulting in conductive or capacitive coupling. In our
study which combines electron energy loss spectroscopy, optical spectroscopy,
and numerical simulations, we show coexistence of strongly and weakly
hybridized modes. While the properties of the former ones strongly depend on
the nature of the junction, the properties of the latter ones are nearly
unaffected. This opens up a prospect for independent engineering of different
plasmonic modes in a single plasmonic antenna. In addition, we show that
Babinet's principle allows to engineer the near field of plasmonic modes
independent of their energy. Finally, we demonstrate that combined electron
energy loss imaging of a plasmonic antenna and its Babinet-complementary
counterpart allows to reconstruct the distribution of both electric and
magnetic near fields of localised plasmonic resonances supported by the antenna
as well as charge and current antinodes of related charge oscillations.
