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  4. Coherent acoustic phonons in nanostructures investigated by asynchronous optical sampling
 
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2006
Conference Paper
Titel

Coherent acoustic phonons in nanostructures investigated by asynchronous optical sampling

Alternative
Kohärente akustische Phononen in Nanostrukturen untersucht mittels asynchroner optischer Abtastung
Abstract
A new optical pump-probe technique is implemented for the investigation of acoustic phonon dynamics in the GHz to THz frequency range which is based on two asynchronously linked femtosecond lasers. Asynchronous optical sampling (ASOPS) provides die performance of on all-optical oscilloscope and allows us to record optically induced lattice dynamics over nanosecond times with 200 femtoseconds resolution at scan rates of 10 kHz. The generation of coherent acoustic phonons and their propagation and decay dynamics are investigated in semiconductor heterostructures, layered nanoscale materials of relevance for microelectronics, and X-ray mirrors. Changes of the optical properties of tailored semiconductor heterostructures associated with coherent phonon dynamics open the pathway for the modulation of optical signals at up to THz frequencies.
Author(s)
Bartels, A.
Braun, S.
Cerna, R.
Dekorsy, T.
Hudert, F.
Janke, C.
Köhler, K.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Mantl, S.
Schäfer, H.
Wiemer, M.
Hauptwerk
Nanophotonics for Communications. Materials, Devices and Systems III
Konferenz
Conference "Nanophotonics for Communications - Materials, Devices and Systems" 2006
International Symposium on Optics East 2006
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DOI
10.1117/12.687052
Language
English
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Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS
Tags
  • III-V semiconductor

  • III-V Halbleiter

  • superlattice

  • Übergitter

  • time resolved spectro...

  • zeitaufglelöst

  • spectroscopy

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