  Motivated by the recent experiment by Bordia et al [Nat. Phys. 13, 460
(2017)], we study single particle delocalization phenomena of Aubry-Andr\'e
(AA) model subjected to periodic drives. In two distinct cases we construct an
equivalent classical description to illustrate that the drive induced
delocalization phenomena stems from an instability and onset of chaos in the
underlying dynamics. In the first case we analyze the delocalization and the
thermalization in a time modulated AA potential with respect to driving
frequency and demonstrate that there exists a threshold value of the amplitude
of the drive. In the next example, we show that the periodic modulation of the
hopping amplitude leads to an unusual effect on delocalization with a
non-monotonic dependence on the driving frequency. Within a window of such
driving frequency a delocalized Floquet band with mobility edge appears,
exhibiting multifractality in the spectrum as well as in the Floquet
eigenfunctions. Finally, we explore the effect of interaction and discuss how
the results of the present analysis can be tested experimentally.
