1980 Volume 49 Issue 1 Pages 53-56
A method of constructing a point contact Josephson device with “ideal” I-V characteristics is described. Radio frequency (RF) outputs are detected with no intentionally applied external RF fields. Enhancements of output RF intensities occur at the gap and sub-gap voltages. Strong sharp peaks of RF outputs of approximately 10−12 W are observed at lower voltage regions. Effects of thermal and shot noises are discussed in relation to the singularities of an I-V curve.
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