Nonresonant detection of Josephson radiation from thin-film microbridges

O. H. Sørensen, Jesper Mygind, Niels Falsig Pedersen, V. N. Gubankov, M. T. Levinsen, Poul Erik Lindelof

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Measurements are reported of the Josephson radiation from microbridges coupled to an X-band receiver via a nonresonant microwave transformer. Although closely coupled to the bridge, the transformer does not modify the bridge properties. We find that near the transition temperature the radiation linewidth is proportional to the square of the dynamic resistance, which is also predicted by the resistively shunted junction model. The effective noise temperature determined by the linewidth is 19±3 K and the measured maximum integral power is 5×10−12 W. Journal of Applied Physics is copyrighted by The American Institute of Physics.
Original languageEnglish
JournalJournal of Applied Physics
Issue number12
Pages (from-to)5372-5374
Publication statusPublished - 1977

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Copyright (1977) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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