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SPATIAL INHOMOGENEITIES BY LASER-BASED NANOACOUSTICS
发布人:佚名 信息来源:本站原创  发布时间:2014年10月13日 点击数量:

报告题目:DEPTH-PROFILING OF ACOUSTIC, OPTIC AND ACOUSTO-OPTIC SPATIAL INHOMOGENEITIES BY LASER-BASED NANOACOUSTICS

报告人: Prof. Vitali Gusev, University of Maine, France

: 2014年10月16日(星期四)上午 10:10

: 物理楼 356 室

Prof. Vitali Gusev received Ph.D. degree from Moscow State University, Russia, in 1982, and then has been a Professor of Department of Physics, Moscow State University (1998). Now, he is a Professor of University of Maine, France.

Prof. Gusev has wide research interests including nonlinear acoustics, thermo-acoustics, laser ultrasonics, photoacoustics, interaction of laser radiation with matter, laser-induced ultrafast phenomena, physics of semiconductors and nanomaterials.

His current research interests are: 1) laser-based ultrafast rheology and ultrafast tribology in GHz-THz frequency domain; 2) interaction of acoustic waves with localized modes and non-affine motions in disordered media (granular media, liquids, glasses); 3) application of nonlinear acoustics and laser ultrasonics methods to evaluation and non-destructive testing of nanomaterials and nanostructures.

Prof. Gusev has been invited as Professor of various Universities in USA, Japan, Canada, Belgium and Taiwan, and won a lot scientific awards and honors from different countries, and is a famous specialist in world. Now, he is invited as a high level scientist in Nanjing University of Science and Technology.

报告内容简介:

In ps laser ultrasonics or laser-based nanoacoustics, ultra-short laser pulses are used for generation and detection of acoustic pulses with a typical length from 100 nm down to several nm. These acoustic pulses could be applied for depth profiling, i.e., spatially resolved imaging, of inhomogeneous materials. Monitoring reflection of these wide-band acoustic pulses, incident on interface between solid and liquid, it is possible to determine the near-interface structuring of liquid caused by its interaction with the solid with nm spatial resolution. Picosecond acoustic interferometry, which monitors temporal evolution of single frequency component of these wide-band acoustic pulses, provides opportunity for depth-profiling of optically transparent inhomogeneous materials, for revealing individual micro-crystal in optically isotropic polycrystalline aggregates and monitoring the nonlinear transformation of finite amplitude acoustic pulses of GHz frequency range. The spatial resolution of the method can be controlled either by the spatial scale of linear laser-generated ps acoustic pulse or the spatial width of weak shock front in the nonlinear acoustic pulse. These scales are much shorter than optical wavelength.

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