  Presence of a metal nanoparticle near a quantum dipole emitter, when a
localized surface plasmon mode is excited via the resonant coupling with an
excited quantum dipole, changes dramatically the relaxation dynamics: it is no
longer described by an exponential decay but exhibits step-like behavior. The
main physical consequence of this relaxation process is that the emission,
being largely determined by the metal nanoparticle, comes out with a
substantial delay. A large number of system parameters in our analytical
description opens new possibilities for controlling quantum emitter dynamics.
