ISSTT Proceedings

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Quasioptical High-Tc Superconductor Josephson Mixer at Terahertz Frequencies

Authors:
Marian Darula, Alex D. Semenov, Heinz-Wilhelm Hübers, Josef Schubert
Abstract:
Mixers based on Josephson junctions from conventional superconductor materials have demonstrated excellent performance at subgap frequencies. The advantages of Josephson mixers are low optimal power of the local oscillator and large intermediate frequency bandwidth but their noise temperature increases dramatically at frequencies corresponding to the energy gap of the superconductor, which is typically below 1 THz for widely used materials. The large energy gap of oxide superconductors makes them promising candidates for development of terahertz Josephson mixers. Here we report on experimental study of the quasioptical mixer utilizing bicrystal Josephson junction from high-transition-temperature YBa2Cu307-[delta] film. Junctions with a width of 2 µm were fabricated from 100 nm thick laser ablated films on bicrystal MgO substrates and had the and the JcRn product of about 2 mV at 4.2 K.
Categories:
High TC
Year:
2000
Session:
9
Full-text:
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Page Number(s):
515