通过时域布里渊散射对共存高压H2O冰相的单个颗粒的三维表征
3D characterisation of individual grains of coexisting high-pressure H2O ice phases by time-domain Brillouin scattering
摘要：
时域布里渊散射使用超短激光脉冲在固体样品中产生皮秒持续时间的相干声脉冲，并跟随它们的传播，以便以亚光学深度分辨率对材料不均匀性进行成像。声脉冲的宽度将该技术沿脉冲传播方向的空间分辨率限制为小于几十纳米。因此，时域布里渊散射优于经典频域布里渊散射显微镜的轴向分辨率，频域布里渊散射显微镜使用连续激光器和热声子，并且空间分辨率由光聚焦控制。该技术得益于相干声学声子的应用，其应用在生物医学和材料科学的纳米成像方面具有令人兴奋的前景。在这项研究中，我们报告的应用程序的时域布里渊散射的三维成像的多晶水冰含有两个高压阶段。通过同时检测准纵波和准横波完成的成像提供了识别单个晶粒的相位并评估其晶体取向的机会。同时监测声波在两个相邻晶粒中的传播为晶界的局部化提供了额外的手段。
英文摘要：
Time-domain Brillouin scattering uses ultrashort laser pulses to generate coherent acoustic pulses of picoseconds duration in a solid sample and to follow their propagation in order to image 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 nanometres. 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 biomedical 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 for individual grains and evaluate their crystallographic orientation. Monitoring the propagation of the acoustic waves in two neighbouring grains simultaneously provided an additional mean for the localisation of the grain boundaries.
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