Phonon-cooled hot electron bolometer (HEB) mixer elements are promising heterodyne detectors for THz frequencies. The current development status of niobium-titanium nitride (NbTiN) HEB mixers for THz receivers, for example for the GREAT receiver on SOFIA, is presented for both waveguide and quasi-optical mixers. Waveguide mixers are based on 2 /spl mu/md thick silicon nitride membranes which are suspended in a substrate channel and quasi-optical mixers are based on an extended hemispherical silicon lens integrated with logarithmic spiral antennas. The measured DSB receiver noise temperature is 1000 K for waveguide and 2000 K for quasi-optical mixers at 800 GHz RF and 1 GHz IF. The HEB devices are fabricated at KOSMA and consist of a 4-5 nm thin NbTiN film.


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    Title :

    Development of phonon-cooled NbTiN HEB heterodyne mixers for THz applications


    Contributors:
    Bedorf, S. (author) / Munoz, P. (author) / Brandt, M. (author) / Putz, P. (author) / Honingh, N. (author) / Jacobs, K. (author)


    Publication date :

    2004-01-01


    Size :

    155465 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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