Simulating optically generated transient acoustic signals propagating into the ZnO/GaAs bilayer nanosystems

Numerical simulations are established concerning optically stimulated acoustic propagative coherent wavefronts (opto-acoustic transduction) and optically detected acoustic wavefront (acousto-optic transduction). A typical user case is given related to a typical example of a bi-layered system ZnO/GaAs. It corresponds to a typical condensed matter system including a thin film layer deposited on top of a bulk substrate. The numerical study is ab-initio developed into the general context of the thermo-elastic regime, outside of any piezo-electric or deformation potential regime nor charge carrier diffusion, without any required initial software packages, e.g. without introducing any initial (external pre-programmed) software packages and/or requiring a subsidiary sub-model. Transient temporal deformation fields are simulated under homogeneous material conditions. Transient optical reflectivity signals are also simulated, as physically measured signals of interest during the experiments. Limit cases (red/red configuration for pump and probe optical beam, without any thin layer deposited) allow to validate the codes given.