3D imaging of water ice under high-pressure non-hydrostatic load by time-domain Brillouin scattering

Sathyan Sandeep (1) , Théo Thréard (1) , Elton de Lima Savi (1) , Nikolay Chigarev (1) , Alain Bulou (2) , Vincent Tournat (1) , Andreas Zerr (3) , Vitalyi Gusev (1) , Samuel Raetz (1)

1 LAUM - Laboratoire d'Acoustique de l'Université du Mans
2 IMMM - Institut des Molécules et Matériaux du Mans
3 LSPM - Laboratoire des Sciences des Procédés et des Matériaux

Time-domain Brillouin scattering (TDBS) technique is an opto-acousto-optic pumpprobe technique [1] that uses ultrashort laser pulses to generate coherent acoustic pulses (CAPs) of picoseconds duration in a solid sample and follow their propagation in order to image inhomogeneities of acoustic, optical and/or photo-elastic parameters of materials transparent to the probe light wavelength [2]. This technique presents an axial resolution deeply sub-optical (to nm-scale), controlled by the CAPs width, and a lateral one down to the optical diffraction limit, controlled by lateral focusing of used laser beams. Detection of propagating CAPs is possible because they scatter time-delayed probe laser pulses heterodyned by the probe-pulse reflections from stationary sample surfaces, giving rise to an oscillating component in a transient reflectivity signal: the so-called Brillouin oscillation (BO).

Mots clés: High-pressure Phases

Domaines: Acoustique [physics.class-ph]; Matière Condensée [cond-mat]

Sathyan Sandeep, Théo Thréard, Elton de Lima Savi, Nikolay Chigarev, Alain Bulou, et al.. 3D imaging of water ice under high-pressure non-hydrostatic load by time-domain Brillouin scattering. 21st International Conference on Photoacoustic and Photothermal Phenomena, Mladen Franko (University of Nova Gorica, Slovenia), Jun 2022, Bled, Slovenia. pp.53-54. ⟨hal-03862206⟩