  We investigate subgap quasiparticles of a single level quantum dot coupled to
the superconducting and normal leads, whose energy level is periodically driven
by external potential. Using the Floquet formalism we determine the
quasienergies and analyze redistribution of their spectral weights between
individual harmonics upon varying the frequency and amplitude of the driving
potential. We also propose feasible spectroscopic methods for probing the
in-gap quasiparticles observable in the differential conductance of the charge
current averaged over a period of oscillations.
