ISSTT Proceedings

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NbN Phonon-Cooled Hot Electron Bolometer Mixer Development at IRAM

Authors:
C. Rösch, F. Mattiocco, K. H. Gundlach, K. -F. Schuster
Abstract:
NbN phonon cooled bolometric mixers offer very competitive performance up to the highest frequencies. Processing of NbN HEB's is relatively easy and reliable and due to microstructuring by Ebeam lithography LO power could be reduced to a level where pumping is possible with solid state sources and simple beam splitters up to around 1 THz. The typical sheet resistance for very thin NbN films is relatively well adapted to a variety of antennas or waveguide coupling structures. All these points make the NbN bolometric mixers very attractive for radio astronomical applications in the THz regime. The main problem with the NbN devices however stays the limitation in IF bandwidth and contrary to predictions bandwidths beyond 2-3 GHz are hardly reached for NbN films on substrates which are suitable for high frequency applications. After establishing a reliable process, we have focused on the characterisation of the devices and improvements of antenna device coupling.
Categories:
HEB Mixers
Year:
1999
Session:
5
Full-text:
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Page Number(s):
208-214