Records |
Author |
Galin, M. A.; Klushin, A. M.; Kurin, V. V.; Seliverstov, S. V.; Finkel, M. I.; Goltsman, G. N.; Müller, F.; Scheller, T.; Semenov, A. D. |
Title |
Towards local oscillators based on arrays of niobium Josephson junctions |
Type |
Journal Article |
Year |
2015 |
Publication |
Supercond. Sci. Technol. |
Abbreviated Journal |
Supercond. Sci. Technol. |
Volume |
28 |
Issue |
5 |
Pages |
055002 (1 to 7) |
Keywords |
Josephson junction local oscillators, JJ LO |
Abstract |
Various applications in the field of terahertz technology are in urgent need of compact, wide-tunable solid-state continuous wave radiation sources with a moderate power. However, satisfactory solutions for the THz frequency range are scarce yet. Here we report on coherent radiation from a large planar array of Josephson junctions (JJs) in the frequency range between 0.1 and 0.3 THz. The external resonator providing the synchronization of JJ array is identified as a straight fragment of a single-strip-line containing the junctions themselves. We demonstrate a prototype of the quasioptical heterodyne receiver with the JJ array as a local oscillator and a hot-electron bolometer mixer. |
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ISSN |
0953-2048 |
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Serial |
1347 |
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Author |
Gershenzon, E. M.; Gol’tsman, G. N.; Semenov, A. D.; Sergeev, A. V. |
Title |
Mechanism of picosecond response of granular YBaCuO films to electromagnetic radiation |
Type |
Journal Article |
Year |
1991 |
Publication |
IEEE Trans. Magn. |
Abbreviated Journal |
IEEE Trans. Magn. |
Volume |
27 |
Issue |
2 |
Pages |
1321-1324 |
Keywords |
YBCO HTS detectors |
Abstract |
Ultrafast mechanisms of radiation detection in granular YBaCuO films are studied in the wide wavelength range from millimeter waves to near infrared. With an increase in radiation frequency, the Josephson detection at the grain-boundary weak links is replaced by electron heating into the grains. This change occurs in the submillimeter wavelength range. The electron-phonon relaxation time tau /sub eph/ is determined from direct measurements, quasi-stationary electron heating measurements, and the frequency dependence of the current at which maximum voltage shift is observed. The temperature dependence of tau /sub eph/ at T<or=40 K was found to be tau /sub eph/ approximately T/sup -1/. The results show that detectors with a response time of a few picoseconds at nitrogen temperature are attainable. |
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ISSN |
1941-0069 |
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no |
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Serial |
1679 |
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Author |
Semenov, A. D.; Goghidze, I. G.; Gol’tsman, G. N.; Sergeev, A. V.; Aksaev, E. E.; Gershenzon, E. M. |
Title |
Non-equilibrium quasiparticle response to radiation and bolometric effect in YBaCuO films |
Type |
Journal Article |
Year |
1993 |
Publication |
IEEE Trans. Appl. Supercond. |
Abbreviated Journal |
IEEE Trans. Appl. Supercond. |
Volume |
3 |
Issue |
1 |
Pages |
2132-2135 |
Keywords |
YBCO HTS HEB detectors |
Abstract |
The voltage photoresponse of structured current biased YBCO films on different substrates to 20-ps laser pulses of 0.63- mu m and 1.54- mu m wavelengths and to continuously modulated radiation of 2-mm wavelength is measured to temperatures around Tc. Fast picosecond decay of the response to pulsed radiation is followed by slow exponential relaxation with a nanosecond characteristic time depending on the substrate material and film dimensions. The slow component does not depend on wavelength and is attributed to the bolometric effect, while the magnitude of the fast component associated with nonequilibrium response rises with wavelength. More than an order-of-magnitude increase of the nonequilibrium response is seen from near-infrared to millimeter-wave range. This dependence plausibly reflects the low efficiency of multiplication of photoexcited electrons in YBaCuO compared to conventional superconductors. |
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ISSN |
1558-2515 |
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1659 |
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Author |
Gershenzon, E. M.; Gol'tsman, G. N.; Gogidze, I. G.; Semenov, A. D.; Sergeev, A. V. |
Title |
Processes of electron-phonon interaction in thin YBaCuO films |
Type |
Journal Article |
Year |
1991 |
Publication |
Phys. C: Supercond. |
Abbreviated Journal |
Phys. C: Supercond. |
Volume |
185-189 |
Issue |
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Pages |
1371-1372 |
Keywords |
YBCO HTS detectors |
Abstract |
The ultrafast voltage response of YBaCuO films to laser radiation is studied and compared with previously investigated quasiparicles response to radiation of submillimeter wavelength range. Voltage shift under the visible light radiation has two components. Picosecond response realized as suppression superconductivity by nonequilibrium excess quasiparticles, response time is determined by quasiparticles recombination rate. Nanosecond response is probably due to bolometric effect. |
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Edition |
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ISSN |
0921-4534 |
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no |
Call Number |
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Serial |
1676 |
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Author |
Gershenzon, E. M.; Gol'tsman, G. N.; Semenov, A. D.; Sergeev, A. V. |
Title |
Mechanism of picosecond response of granular YBaCuO films to electromagnetic radiation |
Type |
Journal Article |
Year |
1990 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Communications |
Volume |
76 |
Issue |
4 |
Pages |
493-497 |
Keywords |
YBCO HTS detectors |
Abstract |
The ultrafast mechanisms of radiation detection in granular YBaCuO films are studied in the wide wavelength range from millimeter to near infrared. With the rise of radiation frequency the Josephson detection at the grain boundary weak links is replaced by electron heating into the grains. This change occurs in the submillimeter wavelength range. Electron-phonon relaxation time τeph is determined by direct measurements and analyses quasistationary electron heating. Temperature dependence of τeph at T ≤ 40 K was found to be τeph ∼ T−1. The results show that detectors with the response time of few picoseconds at nitrogen temperature are attainable. |
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Edition |
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ISSN |
0038-1098 |
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no |
Call Number |
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Serial |
1685 |
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