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Signal and noise characteristics of a terahertz frequency-selective YBa2Cu3O7−x Josephson detector

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Abstract

The performance characteristics of a frequency-selective Josephson detector based on a symmetrical [001]-tilt YBa2Cu3O7−x bicrystal junction have been studied in the terahertz frequency range. At an external radiation frequency of 0.692 THz and a detector temperature of 55 K, the volt-watt responsivity reaches (7 ± 2) × 104 V/W, which corresponds to theoretical estimates calculated with allowance for thermal fluctuations in the junction. The noise equivalent power (2.9 ± 0.9) × 10–13 W/Hz1/2 and the power dynamic range D = 47 ± 3 dB of the detector are determined by the excess 1/f type noise in the junction. It is shown that NEP values up to 5 × 10−15 W/Hz1/2 and D above 60 dB can be reached with high-frequency modulators or pulsed sources of terahertz radiation.

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Authors and Affiliations

  1. Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, Russia

    M. V. Lyatti, D. A. Tkachev & Yu. Ya. Divin

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  1. M. V. Lyatti
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  2. D. A. Tkachev
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  3. Yu. Ya. Divin
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Original Russian Text © M.V. Lyatti, D.A. Tkachev, Yu.Ya. Divin, 2006, published in Pis’ma v Zhurnal Tekhnicheskoĭ Fiziki, 2006, Vol. 32, No. 19, pp. 79–85.

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Lyatti, M.V., Tkachev, D.A. & Divin, Y.Y. Signal and noise characteristics of a terahertz frequency-selective YBa2Cu3O7−x Josephson detector. Tech. Phys. Lett. 32, 860–863 (2006). https://doi.org/10.1134/S1063785006100130

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  • DOI: https://doi.org/10.1134/S1063785006100130

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