ISSTT Proceedings

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Mixing Experiments at W-Band Using High-TC Josephson Junctions

Authors:
O. Harnack, M. Darula, S. Beuven, B. Kohlstedt
Abstract:
We report on the mixing properties of high-Tc superconductor (HIS) Josephson junctions. Direct radiation and heterodyne mixing experiments in the frequency range 78 GHz-119 GHz have been performed using YBa2Cu307-x (YBCO) step-edge junctions (SO) and bicrystal junctions (BCD on LaA10 3 and MgO substrates. Under external radiation our junctions showed harmonic phase synchronization (Shapira steps) up to 1.88 THz. Junctions with current voltage characteristics (1VC) close to predictions of the resistively shunted junction model (RSJ) we mounted into a heterodyne mixing setup. Under the radiation of two monochromatic signals we obtained conversion efficiencies around -14 dB in the 11 GHz intermediate frequency (IF) band. In the fundamental mixing regime we observed response at IF at working temperatures up to 72K. We demonstrated the operation of HTS Josephson junctions in the self-mixing mode. The expetimental results are in good agreement with simulations using the RSJ model.
Categories:
Detectors
Year:
1997
Session:
11
Full-text:
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Page Number(s):
557-565