  We present a theoretical approach to study the effect of microwave radiation
on the magnetoresistance of a one-dimensional superlattice.
  In our proposal the magnetoresistance of a unidirectional spatial periodic
potential (superlattice), is modulated by microwave radiation due to an
interference effect between both, space and time-dependent potentials. The
final magnetoresistance will mainly depend on the spatial period of the
superlattice and the radiation frequency. %Then, by tuning either the spatial
period of the superlattice or the radiation %frequency, the magnetoresistance
can be strongly modified. We consider an approach to study these effects based
on the fast Fourier transform of the obtained magnetorresistance profiles in
function of the inverse of the magnetic field. Based on this theory we propose
the design of a novel radiation sensor for the Terahertz band.} % We first
study the FFT of the system for each potential individually. Then we study
jointly the FFT of the system when the two types of potentials are
simultaneously acting.
