  Sharp metal corners and tips support plasmons localized on the scale of the
curvature radius -- superlocalized plasmons. We analyze plasmonic properties of
nanoparticles with small and sharp corner- and tip-shaped surface perturbations
in terms of hybridization of the superlocalized plasmons, which frequencies are
determined by the perturbations shape, and the ordinary plasmons localized on
the whole particle. When the frequency of a superlocalized plasmon gets close
to that of the ordinary plasmon, their strong hybridization occurs and
facilitates excitation of an optical hot-spot near the corresponding
perturbation apex. The particle is then employed as a nano-antenna that
selectively couples the free-space light to the nanoscale vicinity of the apex
providing precise local light enhancement by several orders of magnitude.
