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Communication Dans Un Congrès Année : 2012

Superlattice ultrasonic generation

Thomas Wilson
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  • PersonId : 939158
Michael Oehme
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  • PersonId : 939159
Erich Kasper
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  • PersonId : 939160
Hans-Joachim Gossmann
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  • PersonId : 939161
Jörg Schulze
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  • PersonId : 939162

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Résumé

We present experimental results of the resonant excitation of coherent high-frequency longitudinal acoustic phonons in semiconducting doping superstructures by far-infrared laser radiation. After a grating-coupled delta-doped silicon doping superlattice is illuminated with 10 kW/mm2 nanosecond-pulsed 246 GHz laser radiation, a delayed nanosecond pulse is detected by a current-biased superconducting granular aluminum/palladium bilayer bolometer, at a time corresponding to the appropriate time of flight for ballistic longitudinal acoustic phonons across the (100) silicon substrate. The absorbed phonon power density in the microbolometer is observed to be 10 \mu W/mm2, in agreement with theory. Upon deconvolution, the phonon pulse duration matches the laser pulse duration. The absence of any delayed transverse acoustic phonon signal by the superconducting bolometer is particularly striking and implies there is little or no incoherent phonon generation occurring in the process. Attempts at: (1) 1.04 THz phonon generation and (2) the use of Si:B piezo-phonon spectroscopy to measure the frequency and linewdith of the phonon distribution, will also be described.
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Dates et versions

hal-00810669 , version 1 (23-04-2012)

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  • HAL Id : hal-00810669 , version 1

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Thomas Wilson, Michael Oehme, Erich Kasper, Hans-Joachim Gossmann, Jörg Schulze. Superlattice ultrasonic generation. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810669⟩

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