  Surface plasmon polaritons in planar graphene superlattices with
one-dimensional periodic mo-dulation of the band gap were studied. The
interminiband contribution to the optical conductivity of this system was found
by the equation of motion method for two cases: the Fermi level falls within
one of the minigaps and the Fermi level is located within one of the minibands.
It was shown that the optical conductivity of the system varies significantly
in these cases. The spectra of surface plasmon polaritons in the system differs
for them.
