Séminaires à venir / Upcoming

    • (titre à venir), par Hadrien Beriot, Siemens

      2018
      10
      09

      (résumé à venir)

    • Picosecond ultrasonics and phonon spectroscopy, par Prof. Andrey Akimov from the School of Physics and Astronomy, The University of Nottingham, UK, invité par Samuel R.

      2018
      10
      16

      Picosecond ultrasonics is an advanced technique which uses short laser pulses to generate and detect terahertz acoustic waves (i.e. coherent phonons). During last decade picosecond ultrasonics have been used for: nanoscopy with nanometer resolution; understanding phonon transport properties in complex nanostructures; and control of optical and electronic devices. Picosecond ultrasonics enables to obtain phonon spectra for compressive and shear acoustic waves in sub-THz and THz frequency ranges in various nanoobjects. In the first part of the talk the basic principles and main achievements of the picosecond ultrasonics and coherent phonon spectroscopy will be given. Recent experiments performed in the University of Nottingham on the studies of van der Waals nanolayers and development of new phonon spectroscopy methods will be described in the second part of the talk.