[Todos] Coloquios DF: Bernard Jusserand (Inst. Nanosciences Paris, UPMC)- Hoy Jueves 7/3, 14hs, Aula Seminario, 2do piso, Pab. I

[pdmitruk en df.uba.ar]

Recordamos el coloquio de hoy,

  COLOQUIOS DEL DEPARTAMENTO DE FÍSICA FCEYN - UBA

  En el Aula Seminario, 2do piso, Pab. I, 

  Jueves 7/3, 14hs:

  Bernard Jusserand

  Institut Des Nanosciences De Paris, UPMC-CNRS.

   
   

  SON ET LUMIèRE : A COMBINED ENGINEERING OF PHOTONS AND ACOUSTIC PHONONS
IN
  SEMICONDUCTOR NANOSTRUCTURES

  Abstract:
    Semiconductor superlattices are periodic stacks of two different
  materials, such as GaAs and AlAs, well known for their novel electronic
and
  photonic properties. In this talk, I will present the ideas which we
  developed in the past years, how to transfer the same ideas to the field
of
  acoustic phonons in multilayers. I will recall the concepts of folded
  acoustic phonon in a periodic multilayer stack and of cavity phonons in a
  novel device: the acoustic nanocavity.

  Using pump-probe and Raman scattering experiments, we have demonstrated
  that the acoustic nanodevices are very efficient generators and detectors
  of quasi-monochromatic acoustic wave packets up to frequencies around 1
THz
  and that their properties can be widely engineered by adjusting the
devices
  parameters and the transduction wavelength. High resolution Raman
  scattering (10-2 cm-1) also allowed us to determine the lifetime of
  acoustic phonons confined in nanocavities.
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