| Records |
| Author |
Koshelets, V. P.; Dmitriev, P. N.; Ermakov, A. B.; Filippenko, L. V.; Koryukin, O. V.; Torgashin, M. Yu.; Khudchenko, A. V. |
| Title |
Integrated superconducting spectrometer for atmosphere monitoring |
Type |
Journal Article |
| Year |
2005 |
Publication |
Radiophys. Quant. Electron. |
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48 |
Issue |
10-11 |
Pages |
844-850 |
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SIR |
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0033-8443 |
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519 |
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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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no |
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588 |
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Тарасов, М.; Кузьмин, Л. |
| Title |
Концепция смесителя на основе болометра на холодных электронах |
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Journal Article |
| Year |
2005 |
Publication |
Письма в ЖЭТФ |
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81 |
Issue |
10 |
Pages |
661-664 |
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CEB, mixer |
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545 |
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Baselmans, J. J. A.; Baryshev, A.; Reker, S. F.; Hajenius, M.; Gao, J. R.; Klapwijk, T. M.; Vahtomin, Yu.; Maslennikov, S.; Antipov, S.; Voronov, B.; Gol'tsman, G. |
| Title |
Direct detection effect in small volume hot electron bolometer mixers |
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Journal Article |
| Year |
2005 |
Publication |
Appl. Phys. Lett. |
Abbreviated Journal |
Appl. Phys. Lett. |
| Volume |
86 |
Issue |
16 |
Pages |
163503 (1 to 3) |
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HEB, mixer, direct detection effect |
| Abstract |
We measure the direct detection effect in a small volume (0.15μm×1μm×3.5nm)(0.15μm×1μm×3.5nm) quasioptical NbN phonon cooled hot electronbolometermixer at 1.6THz1.6THz. We find that the small signal sensitivity of the receiver is underestimated by 35% due to the direct detection effect and that the optimal operating point is shifted to higher bias voltages when using calibration loads of 300K300K and 77K77K. Using a 200GHz200GHzbandpass filter at 4.2K4.2K the direct detection effect virtually disappears. This has important implications for the calibration procedure of these receivers in real telescope systems. |
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377 |
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An, Zhenghua; Chen, Jeng-Chung; Ueda, T.; Komiyama, S.; Hirakawa, K. |
| Title |
Infrared phototransistor using capacitively coupled two-dimensional electron gas layers |
Type |
Journal Article |
| Year |
2005 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
| Volume |
86 |
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172106 - 172106-3 |
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2DEG |
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RPLAB @ akorneev @ |
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603 |
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