Ultrafast, ultra-broad-band photoconductive detector based on heavily doped and highly compensated germanium has been demonstrated. Such a material demonstrates optical sensitivity in the more than 8 octaves, in the infrared, from about 2 mm to about 8 μm. The spectral sensitivity peaks up between 2 THz and 2.5 THz and is slowly reduced towards lower and higher frequencies. The life times of free electrons/holes measured by a pump-probe technique approach a few tenths of picoseconds and remain almost independent on the optical input intensity and on the temperature of a detector in the operation range. During operation, a detector is cooled down to liquid helium temperature but has been approved to detect, with a reduced sensitivity, up to liquid nitrogen temperature. The response time is shorter than 200 ps that is significantly faster than previously reported times.


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    Titel :

    Towards a life-time-limited 8-octave-infrared photoconductive germanium detector


    Beteiligte:
    Pavlov, S.G. (Autor:in) / Deßmann, N. (Autor:in) / Pohl, Andreas (Autor:in) / Abrosimov, Nickolay (Autor:in) / Mittendorff, Martin (Autor:in) / Winnerl, S. (Autor:in) / Zhukavin, R.Kh. (Autor:in) / Tsyplenkov, V.V. (Autor:in) / Shengurov, D.V. (Autor:in) / Shastin, V.N. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2015



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




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