Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..605..153f&link_type=abstract
LOW TEMPERATURE DETECTORS: Ninth International Workshop on Low Temperature Detectors. AIP Conference Proceedings, Volume 605, p
Astronomy and Astrophysics
Astronomy
1
Superconducting Optical, X-Ray, And Gamma-Ray Detectors, X- And Gamma-Ray Telescopes And Instrumentation
Scientific paper
The properties of Superconducting Tunnel Junctions (STJ) make them very suitable for low light level astronomical observations from the visible to the near-infrared. We have developed a modified version of the ``SNEP'' fabrication process for making Ta/Al-AlOx-Al/Ta/Nb photon counting STJ devices. These junctions show a very low sub-gap leakage current at 0.2 K. They use a double thin aluminum trapping layer and a Ta absorber grown epitaxially on a R-plane sapphire substrate. The parameters of the junctions have been investigated in order to optimize future devices, i.e. pixel area, Josephson current density, subgap leakage current, Ta mean free path. Photon counting ability in the near infrared at 0.78 micron has been demonstrated with such Ta-based junctions. .
Benoît Alain
Delaët Bertrand
Feautrier Philippe
Jorel Corentin
Le Coarer Etienne
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