  We theoretically study hot electron generation through the emission of a
dipole source coupled to a nanoresonator on a metal surface. In our hybrid
approach, we solve the time-harmonic Maxwell's equations numerically and apply
a quantum model to predict the efficiency of hot electron generation. Strongly
confined electromagnetic fields and the strong enhancement of hot electron
generation at the metal surface are predicted and are further interpreted with
the theory of quasinormal modes. In the investigated nanoresonator setup, both
the emitting source and the acceptor resonator are localized in the same
volume, and this configuration looks promising to achieve high efficiencies of
hot electron generation. By comparing with the efficiency calculated in the
absence of the plasmonic nanoresonator, that is, the dipole source is located
near a flat, unstructured metal surface, we show that the effective excitation
of the modes of the nanoresonator boosts the generation efficiency of energetic
charge carriers. The proposed scheme can be used in tip-based spectroscopies
and other optoelectronic applications.
