Josephson Devices for Spectral Analysis
Development of High-Sensitive Devices for Registration and Spectral Analysis of Terahertz Weak Electromagnetic Radiation on the Base of Thin Film Josephson Junction from High-Tc Superconductors
Tech Area / Field
- INS-DET/Detection Devices/Instrumentation
- PHY-RAW/Radiofrequency Waves/Physics
8 Project completed
Senior Project Manager
Komarkov D A
Russian Academy of Sciences / Institute of Radioengineering and Electronics, Russia, Moscow
- Forschungszentrum Jülich / Institut für Festkörperforschung, Germany, Jülich\nTechnical University of Denmark, Denmark, Lyngby
Project summaryDevelopment of high-sensitive devices for registration and spectral analysis of terahertz weak electromagnetic radiation on the base of thin film Josephson junctions from high-Tc superconductors.
In the present project it is supposed to investigate possibility of a new type of spectroscopy with using of Hilbert transformation. In this case a thin film Josephson junction from high-Tc superconductors is the basic spectral element. Interaction of weak external electromagnetic radiation with self-oscillation of the Josephson junction gives an opportunity to determine spectral composition of radiation from the measurement of the Josephson junction I-V curve modification produced by the external signal followed by Hilbert transformation of the measured data.
The results of investigations, obtained by the IRE RAS scientific group, presented this project, and also other scientific groups from Russia and other countries, which study microwave properties of high-Tc thin film YBaCuO weak links, testify that Josephson junctions, produced on the NdGaO3 bicrystal substrate bond interface, can be applied as nonlinear active elements of high-sensitive receiving devices of millimeter and submillimeter wave ranges.
At the present time reassured results are obtained in this field, namely: possibility of analysis of the signal’s spectra is shown in frequency range 50-3000 GHz with using of closed cycle cryogenic system with ~30-85 K working temperature interval and spectral resolution ~10-3. The last circumstance is the most interesting. Other important features are relatively small spectrometer weight and therefore its high mobility and low cost (in comparison with known spectral devices) because Josephson junction makes decomposition of the external signal by the spectral components directly and this property permits to eliminate relatively expensive optical-mechanical elements, used in traditional spectrometers.
Possibility of detection of electromagnetic signals with complicated spectra in millimeter and submillimeter wave ranges with simultaneous analysis of their spectral structure in a real time scale with the use of Hilbert transformation discovers new perspectives for decision of complex problems and tasks in different fields of experimental physics , technique of high-frequency devices, ecology, medicine and etc.
At present time the observed new method of spectroscopy has been applied for the following measurements:
- characterization of commercial oscillators, based on Gunn diode;
- characterization of commercial; gas lasers;
- measurement of spectral density of reentrant electromagnetic radiation in electron-beam accelerator (DESY, Hamburg)
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