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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