| Records |
| Author |
Gao, J. R.; Hovenier, J. N.; Yang, Z. Q.; Baselmans, J. J. A.; Baryshev, A.; Hajenius, M.; Klapwijk, T. M.; Adam, A. J. L.; Klaassen, T. O.; Williams, B. S.; Kumar, S.; Hu, Q.; Reno, J. L. |
| Title |
Terahertz heterodyne receiver based on a quantum cascade laser and a superconducting bolometer |
Type |
Journal Article |
| Year |
2005 |
Publication |
Appl. Phys. Lett. |
Abbreviated Journal |
Appl. Phys. Lett. |
Volume  |
86 |
Issue |
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Pages |
244104 (1 to 3) |
| Keywords |
HEB, QCL |
| Abstract |
We report the first demonstration of an all solid-stateheterodyne receiver that can be used for high-resolution spectroscopy above 2THz suitable for space-based observatories. The receiver uses a NbN superconducting hot-electron bolometer as mixer and a quantum cascade laser operating at 2.8THz as local oscillator. We measure a double sideband receiver noise temperature of 1400K at 2.8THz and 4.2K, and find that the free-running QCL has sufficient power stability for a practical receiver, demonstrating an unprecedented combination of sensitivity and stability. |
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905 |
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| Author |
Тарасов, М.; Кузьмин, Л. |
| Title |
Концепция смесителя на основе болометра на холодных электронах |
Type |
Journal Article |
| Year |
2005 |
Publication |
Письма в ЖЭТФ |
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| Volume |
81 |
Issue |
10 |
Pages |
661-664 |
| Keywords |
CEB, mixer |
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545 |
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Tol, J. van; Brunel, L.-C.; Wylde, R. J. |
| Title |
A quasioptical transient electron spin resonance spectrometer operating at 120 and 240 GHz |
Type |
Journal Article |
| Year |
2005 |
Publication |
Rev. Sci. Instrum. |
Abbreviated Journal |
Rev. Sci. Instrum. |
| Volume |
76 |
Issue |
7 |
Pages |
074101 (1 to 8) |
| Keywords |
Schottky, noise temperature |
| Abstract |
A new multifrequency quasioptical electron paramagnetic resonance (EPR) spectrometer is described. The superheterodyne design with Schottky diode mixer/detectors enables fast detection with subnanosecond time resolution. Optical access makes it suitable for transient EPR (TR-EPR) at 120 and 240 GHz. These high frequencies allow for an accurate determination of small g-tensor anisotropies as are encountered in excited triplet states of organic molecules like porphyrins and fullerenes. The measured concentration sensitivity for continuous-wave (cw) EPR at 240 GHz and at room temperature without cavity is 1013 spins/cm3 (15 nM) for a 1 mT linewidth and a 1 Hz bandwidth. With a Fabry-Perot cavity and a sample volume of 30 nl, the sensitivity at 240 GHz corresponds to [approximate]3×109 spins for a 1 mT linewidth. The spectrometer's performance is illustrated with applications of transient EPR of excited triplet states of organic molecules, as well as cw EPR of nitroxide reference systems and a thin film of a colossal magnetoresistance material. |
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Actually, noise spectral density is given (3e-19 W/Hz) |
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588 |
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Finkel, M. I.; Maslennikov, S. N.; Gol'tsman, G. N. |
| Title |
Terahertz heterodyne receivers based on superconductive hot-electron bolometer mixers |
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Journal Article |
| Year |
2005 |
Publication |
Radiophys. Quant. Electron. |
Abbreviated Journal |
Radiophys. Quant. Electron. |
| Volume |
48 |
Issue |
10-11 |
Pages |
859-864 |
| Keywords |
HEB, applications |
| Abstract |
We consider recent results in development of hot-electron bolometer mixers. Special attention is paid to optimization of the contacts between the antenna and the active area of a superconducting film. An important result in the study of the parasitic effect of direct detection is obtained during the measurement of the noise temperatures by the hot/cold load method. The latest results of studies of the waveguide hot-electron bolometer mixers and their successful practical applications are considered. Progress in development of high-frequency (over 1.3 THz) heterodyne receivers for several important international projects is discussed and new submillimeter radio astronomy projects ESPRIT and SAFIR are described. |
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0033-8443 |
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no |
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381 |
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| Author |
Финкель, М. И.; Масленников, С. Н.; Гольцман, Г. Н. |
| Title |
Супергетеродинные терагерцовые приёмники со сверхпроводниковым смесителем на электронном разогреве |
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Journal Article |
| Year |
2005 |
Publication |
Известия высших учебных заведений. Радиофизика |
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48 |
Issue |
10 |
Pages |
964-970 |
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russian |
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Duplicated as 381 |
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380 |
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