  We report on the study of terahertz radiation induced MIRO-like oscillations
of magneto-resistivity in GaAs heterostructures. Our experiments provide an
answer on two most intriguing questions - effect of radiation helicity and the
role of the edges - yielding crucial information for understanding of the MIRO
origin. Moreover, we demonstrate that the range of materials exhibiting
radiation-induced magneto-oscillations can be largely extended by using
high-frequency radiation.
