  By means of Monte Carlo simulations on a kinetic model, we demonstrate that
the efficiency of a photoinduced phase change can in general be enhanced
drastically by using a superstructure of an appropriate combination of two
components. This is due to the accelerated nucleation of converted domains in
the structural blocks relatively close to local instability. The present
mechanism provides a general guideline on the design of photocontrollable
materials with potential applications for memory and storage devices.
