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Giovannini, Marcella

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Giovannini, Marcella
Affiliation principale
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Ancien.ne collaborateur.trice
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https://libra.unine.ch/handle/123456789/32206

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  • Publication
    Accès libre
    Applications for quantum cascade lasers and detectors in mid-infrared high-resolution heterodyne astronomy
    (2008)
    Krötz, Peter
    ;
    Stupar, D.
    ;
    Krieg, J.
    ;
    Sonnabend, Guido
    ;
    Sornig, M.
    ;
    Giorgetta, Fabrizio R.
    ;
    Baumann, Esther
    ;
    Giovannini, Marcella 
    ;
    Hoyler, Nicolas
    ;
    Hofstetter, Daniel 
    ;
    Schieder, R.
    Quantum cascade (QC) structures, for both emitting and detecting mid-infrared radiation, are powerful devices for spectroscopy. QC lasers (QCLs), which have been built for nearly 15 years, already play the leading role in certain wavelength regions. QC detectors (QCDs) are a fairly new development, which has been evolving from the QCL research. In high-resolution heterodyne spectrometers for astronomy, such as the Cologne tuneable heterodyne infrared spectrometer (THIS), QC devices help to open new windows to space as discussed in this paper. We will briefly review the use of QC devices in THIS, show recent results in measuring planetary atmospheric dynamics and give an outlook to astronomical goals for the future.
  • Publication
    Accès libre
    16.5 µm quantum cascade detector using miniband transport
    (2007)
    Giorgetta, Fabrizio R.
    ;
    Baumann, Esther
    ;
    Graf, Marcel
    ;
    Ajili, Lassaad
    ;
    Hoyler, Nicolas
    ;
    Giovannini, Marcella 
    ;
    Faist, Jérôme
    ;
    Hofstetter, Daniel 
    ;
    Krötz, Peter
    ;
    Sonnabend, Guido
    The authors report on an InP based photovoltaic quantum cascade detector operating at 16.5 µm and using miniband-based vertical transport. This concept allowed the construction of a longitudinal optical phonon extraction stair with two rungs without touching on a high device resistance. At 10 K, they observed a responsivity of 1.72 mA/W and a Johnson noise limited detectivity of 2.2×109 Jones. Altogether, this design resulted in detection at temperatures of up to 90 K with a lower bandwidth limit of 200 MHz imposed by the measurement setup.