Time-domain Brillouin scattering by quasi-longitudinal and quasi-shear acoustic pulses for 3D characterisation of individual ice grains at high pressure
2020
Time-domain Brillouin scattering uses ultrashort probe laser pulses and coherent acoustic pulses of picoseconds duration, generated and detected by ultrashort pump laser pulses, for imaging material inhomogeneities with sub-optical depth resolution. The width of the acoustic pulse limits the spatial resolution of the technique along the direction of the pulse propagation to less than several tens of nanometers. Thus, the time-domain Brillouin scattering outperforms axial resolution of the classical frequency-domain Brillouin scattering microscopy, which uses continuous lasers and thermal phonons and which spatial resolution is controlled by light focusing. The technique benefits from the application of the coherent acoustic phonons, and its application has exciting perspectives for the nanoscale imaging in bio-medical and material sciences. In this study, we report on the application of the time-domain Brillouin scattering to the 3D imaging of a polycrystal of water ice containing two high-pressure phases. The imaging, accomplished via a simultaneous detection of quasi-longitudinal and quasi-shear waves, provided the opportunity to identify the phase of individual grains and evaluate their orientation. Monitoring the propagation of the acoustic waves in two neighbour grains simultaneously provided an additional mean for the localisation of the grain boundaries.
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