| Records |
| Author |
Verevkin, A.; Gershenzon, E. M.; Gol'tsman, G. N.; Ptitsina, N. G.; Chulkova, G. M.; Smirnov, K. S.; Sobolewski, R. |
| Title |
Direct measurements of energy relaxation times in two-dimensional structures under quasi-equilibrium conditions |
Type |
Conference Article |
| Year |
2002 |
Publication |
Mater. Sci. Forum |
Abbreviated Journal |
Mater. Sci. Forum |
| Volume |
384-3 |
Issue |
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Pages |
107-116 |
| Keywords |
2DEG, AlGaAs/GaAs |
| Abstract |
A new microwave technique was successfully applied for direct studies of energy relaxation times in two-dimensional AlGaAs/GaAs structures under quasi-equilibrium conditions in the nanosecond and picosecond time scale. We report our results of energy relaxation time measurements in the temperature range 1.6-50 K, in quantum Hall effect regime in magnetic fields up to 4 T. |
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Materials Science Forum |
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1536 |
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| Author |
Aksaev, E. E.; Gershenzon, E.M.; Gol'tsman, G. N.; Mirskij, G. I.; Semenov, A. D. |
| Title |
Submillimetric spectrometer-relaxometer based on backward-wave tubes with picosecond time resolution |
Type |
Journal Article |
| Year |
1991 |
Publication |
Pribory i Tekhnika Eksperimenta |
Abbreviated Journal |
Pribory i Tekhnika Eksperimenta |
| Volume |
34 |
Issue |
2 |
Pages |
125-131 |
| Keywords |
BWO, applications |
| Abstract |
The high-sensitive automatic spectrometer-relaxometer based on backward-wave tubes in the range of 4÷0.25 mm was described permitting to study the response kinetics of sample under investigation in any point of this range with the resolution time of 10-11 s. The relaxation measurements were conducted using oscillation beats of two adequate tubes, the frequency of one of them was fixed, while that of the other one was changeable. The amplitude-frequency characteristic of the response under the conditions of synchronous reception was recorded at beat frequency variation from 107 to 1010 Hz. The high sensitivity was reached by decreasing the device recording band down to 100 Hz in the whole measuring range. |
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0032-8162 |
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no |
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1683 |
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| Author |
Semenov, A.; Engel, A.; Il'in, K.; Gol'tsman, G.; Siegel, M.; Hübers, H.-W. |
| Title |
Ultimate performance of a superconducting quantum detector |
Type |
Journal Article |
| Year |
2003 |
Publication |
Eur. Phys. J. Appl. Phys. |
Abbreviated Journal |
Eur. Phys. J. Appl. Phys. |
| Volume |
21 |
Issue |
3 |
Pages |
171-178 |
| Keywords |
NbN SSPD, SNSPD |
| Abstract |
We analyze the ultimate performance of a superconducting quantum detector in order to meet requirements for applications in near-infrared astronomy and X-ray spectroscopy. The detector exploits a combined detection mechanism, in which avalanche quasiparticle multiplication and the supercurrent jointly produce a voltage response to a single absorbed photon via successive formation of a photon-induced and a current-induced normal hotspot in a narrow superconducting strip. The response time of the detector should increase with the photon energy providing energy resolution. Depending on the superconducting material and operation conditions, the cut-off wavelength for the single-photon detection regime varies from infrared waves to visible light. We simulated the performance of the background-limited infrared direct detector and X-ray photon counter utilizing the above mechanism. Low dark count rate and intrinsic low-frequency cut-off allow for realizing a background limited noise equivalent power of 10−20 W Hz−1/2 for a far-infrared direct detector exposed to 4-K background radiation. At low temperatures, the intrinsic response time of the counter is rather determined by diffusion of nonequilibrium electrons than by the rate of energy transfer to phonons. Therefore, thermal fluctuations do not hamper energy resolution of the X-ray photon counter that should be better than 10−3 for 6-keV photons. Comparison of new data obtained with a Nb based detector and previously reported results on NbN quantum detectors support our estimates of ultimate detector performance. |
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1286-0042 |
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534 |
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Słysz, W.; Węgrzecki, M.; Bar, J.; Grabiec, P.; Gol'tsman, G. N.; Verevkin, A.; Sobolewski, R. |
| Title |
NbN superconducting single-photon detector coupled with a communication fiber |
Type |
Journal Article |
| Year |
2005 |
Publication |
Elektronika : konstrukcje, technologie, zastosowania |
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| Volume |
46 |
Issue |
6 |
Pages |
51-52 |
| Keywords |
NbN SSPD, SNSPD |
| Abstract |
We present novel superconducting single-photon detectors (SSPDs), based on ultrathin NbN films, designed for fiber-based quantum communications (lambda = 1.3 žm and 1.55 žm). For fiber-based operation, our SSPDs contain a special micromechanical construction integrated with the NbN structure, which enables efficient and mechanically very stabile fiber coupling. The detectors combine GHz counting rate, high quantum efficiency and very low level of dark counts. At 1.3 – 1.55 žm wavelength range our detector exhibits a quantum efficiency up to 10%. |
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Polish |
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1481 |
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| Author |
Gershenzon, E. M.; Gol'tsman, G. N. |
| Title |
Hot electron superconductive mixers |
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Conference Article |
| Year |
1993 |
Publication |
Proc. 4th Int. Symp. Space Terahertz Technol. |
Abbreviated Journal |
Proc. 4th Int. Symp. Space Terahertz Technol. |
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Pages |
618-622 |
| Keywords |
HEB mixers |
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1656 |
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