title: Revealing sub-μm and μm-scale textures in H2O ice at megabar pressures by time-domain Brillouin scattering.
abstract: The time-domain Brillouin scattering technique, also known as picosecond ultrasonic interferometry, allows monitoring of the propagation of coherent acoustic pulses, having lengths ranging from nanometres to fractions of a micrometre, in samples with dimension of less than a micrometre to tens of micrometres. In this study, we applied this technique to depth-profiling of a polycrystalline aggregate of ice compressed in a diamond anvil cell to megabar pressures. The method allowed examination of the characteristic dimensions of ice texturing in the direction normal to the diamond anvil surfaces with sub-micrometre spatial resolution via time-resolved measurements of the propagation velocity of the acoustic pulses travelling in the compressed sample. The achieved imaging of ice in depth and in one of the lateral directions indicates the feasibility of three-dimensional imaging and quantitative characterisation of the acoustical, optical and acousto-optical properties of transparent polycrystalline aggregates in a diamond anvil cell with tens of nanometres in-depth resolution and a lateral spatial resolution controlled by pump laser pulses focusing, which could approach hundreds of nanometres.
authors: LUNAM Universités, CNRS, Université du Maine, LAUM UMR-CNRS 6613, Av. O. Messiaen, 72085 Le Mans, France.
authors: Sergey M
authors: SM
authors: Nikitin
authors: LUNAM Universités, CNRS, Université du Maine, LAUM UMR-CNRS 6613, Av. O. Messiaen, 72085 Le Mans, France.
authors: Nikolay
authors: N
authors: Chigarev
authors: LUNAM Universités, CNRS, Université du Maine, LAUM UMR-CNRS 6613, Av. O. Messiaen, 72085 Le Mans, France.
authors: Vincent
authors: V
authors: Tournat
authors: LUNAM Universités, CNRS, Université du Maine, IMMM UMR-CNRS 6283, Av. O. Messiaen, 72085 Le Mans, France.
authors: Alain
authors: A
authors: Bulou
authors: LUNAM Universités, CNRS, Université du Maine, LAUM UMR-CNRS 6613, Av. O. Messiaen, 72085 Le Mans, France.
authors: Damien
authors: D
authors: Gasteau
authors: LUNAM Universités, CNRS, Université du Maine, LAUM UMR-CNRS 6613, Av. O. Messiaen, 72085 Le Mans, France.
authors: Bernard
authors: B
authors: Castagnede
authors: LSPM, UPR-CNRS 3407, Université Paris Nord, Villetaneuse, France.
authors: Andreas
authors: A
authors: Zerr
authors: LUNAM Universités, CNRS, Université du Maine, LAUM UMR-CNRS 6613, Av. O. Messiaen, 72085 Le Mans, France.
authors: Vitalyi E
authors: VE
authors: Gusev