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SUMMARY:Amplification of coherent  sub-THz acoustic phonons in superlattic
 es. Fashioning and Pumping up the sound and the SASER issue LACUS Seminar
DTSTART:20190516T163000
DTEND:20190516T173000
DTSTAMP:20260930T194629Z
UID:13a801fce3ee6f228ad73d8116742052c0b08d5e3c87cf3baa7a9110
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Christos Flytzanis\nLaboratoire de Physique\, ENS\nUnive
 rsité PSL\, France\nWe present and demonstrate(1) a novel concept and sch
 eme of acoustic phonon amplification at sub-THz frequency  and a few nano
 meters wavelength range based on the photodriven acoustoelectric(AE) effec
 t(2) with 100fs light pulses in an electrically biased semiconductor super
 lattice(SL) GaAs/AlGaAs\; the amplification is due to stimulated Cerenkov 
 folded zone ac-phonon(3) emission by electrons undergoing intra-miniband t
 ransport. The process is accounted for with a detailed theoretical model a
 nd extensions are discussed.\n \nWith appropriate phononic microcavity co
 nfiguration it can allow the realization of the SASER (Sound Amplification
  by Stimulated Emission of Radiation) operation(4) the analogue of the Las
 er with sound. In the present configuration it is the analogue of the quan
 tum cascade laser with sound in the sub-THz frequency and a few nm wavelen
 gth range. Such a coherent  phonon source allows for investigations with 
 very high spatial resolution\, almost comparable to that of an electron mi
 croscope\, e.g. in microelectronic devices or in microbiology.\n \n1. K. 
 Shinokita\, Kl. Reimann\, M. Woerner\, Th. Elsaesser\, R. Hey  & Chr. Fly
 tzanis\,                                 
                        \n    Phys. Rev. Letts 11
 6\, 075504 (2016).\n2. For a review\, see N. I. Meyer and  M. H. Jørgens
 en\, in Festkörperprobleme X\,\n    edited by O. Madelung (Vieweg\, Br
 aunschweig\, 1970). pp. 21–124.\n3. M. A. Stroscio and M. Dutta\, Phonon
 s in Nanostructures\, Cambridge Uni Press 2001.\n4. J.C. Jackson\, Plasma 
 Phys. Controlled Fusion 28\, 669(1986) \; I.V Volkov\,S.T. Zavtrak\, I.S.
  Kuten\,\n    Phys. Rev.  E 56\, 1097 (1997)\; R.P. Beardsley\,  A.V.
  Akimov\,  M. Henini & A.J Kent \, Phys. Rev. Letts  \n    104\, 0855
 01 (2010)\n \n 
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495
STATUS:CONFIRMED
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