V. N. Gubankov

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Among various discussed ways of explosive detection, the techniques using electromagnetic radiation are considered as having great potential and research activities are recommended in this field. To identify new threats, like liquid explosives, with low rate of false alarms, fast spectral measurements are required in a broad frequency range from microwave(More)
Frequency-selective and broadband high-T<sub>c</sub> Josephson detectors have been fabricated and characterized. A spectral range from 15 GHz to 5.3 THz has been demonstrated for these detectors. A power dynamic range of 50 dB and a noise equivalent power of 10-<sup>14</sup> W/Hz<sup>1/2</sup> have been realized. A spectral resolution deltaf/f of(More)
Bridging the THz gap in the electromagnetic spectrum requires new technological developments ranging from basic THz elements, like detectors and oscillators, to THz systems, like spectrum analyzers, and imagers. As an example of these new approaches from the field of superconducting electronics, we present our recent developments in Hilbert-transform and(More)
Here we report the results of terahertz photonic elements frequency analysis by the ac Josephson effect. We considered planar resonators. There were observed excitation of fundamental and dipole resonance modes in photonic elements by Josephson oscillations of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub> bicrystal junction. Spectral characteristics of(More)
Josephson oscillators attract a considerable interest as parts of superconducting electronic devices. Numerical simulation of Josephson oscillator in resonator was performed at arbitrary coupling. Parametric excitation is indicated by voltage break at dc IV-curve of Josephson oscillator. A numerical procedure was developed for calculation of static(More)
Detection of THz radiation by YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub> Josephson bicrystal junctions with high characteristic voltages I<sub>c</sub>R<sub>n</sub> up to 8 mV has been studied. The high-resistance junctions have demonstrated a classical detection of radiation with frequencies up to terahertz range. It was shown by numerical simulations,(More)
Here, we report the results of spectral analysis of planar open ring resonators by Josephson spectroscopy. Square shape resonators on separate wafers were positioned in the vicinity of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub> bicrystal Josephson junction (JJ). The DC characteristics of JJ demonstrated specific features related to resonant modes(More)
The influence of Abrikosov vortices (A-vortices) on the dynamics of fluxons (Josephson vortices) in Nb-AlO/sub x/Nb long Josephson tunnel junctions (LJTJs) has been investigated experimentally. Trapping of Abrikosov vortices was obtained by cooling of the junction through the superconducting transition temperature in magnetic fields applied perpendicularly(More)
Frequency-selective high-T/sub c/ Josephson detectors have been fabricated and characterized. A spectral range from 15 GHz to 4.3 THz has been demonstrated for these detectors. A power dynamic range of 50 dB and a noise equivalent power of 10/sup -14/ W/Hz/sup 1/2/ have been realized. A spectral resolution /spl delta/f/f 10/sup -3/ has been achieved in the(More)
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