| Records |
| Author |
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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Morozov, D. V.; Smirnov, K. V.; Smirnov, A. V.; Lyakhov, V. A.; Goltsman, G. N. |
| Title |
A millimeter-submillimeter phonon-cooled hot-electron bolometer mixer based on two-dimensional electron gas in an AlGaAs/GaAs heterostructure |
Type |
Journal Article |
| Year |
2005 |
Publication |
Semicond. |
Abbreviated Journal |
Semicond. |
| Volume |
39 |
Issue |
9 |
Pages |
1082-1086 |
| Keywords |
2D electron gas, AlGaAs/GaAs heterostructures, mixers |
| Abstract |
Experimental results obtained by studying the main characteristics of a millimeter-submillimeter wave mixer based on the hot-electron effect in a two-dimensional electron gas in a AlGaAs/GaAs heterostructure with a phonon-scattering cooling mechanism for charge carriers are reported. The gain bandwidth of the mixer is 4 GHz, the internal conversion losses are 13 dB, and the optimum local-oscillator power is 0.5 μW (for a mixer area of 1 μm2). It is shown that a millimeter-submillimeter-wave receiver with a noise temperature of 1900 K can be developed on the basis of a AlGaAs/GaAs mixer. This mixer also appears to be promising for use in array receiver elements. |
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1063-7826 |
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1463 |
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Encrenaz, Thérèse |
| Title |
Neutral Atmospheres of the Giant Planets: An Overview of Composition Measurements |
Type |
Journal Article |
| Year |
2005 |
Publication |
Space Science Reviews |
Abbreviated Journal |
Space Sci Rev |
| Volume |
116 |
Issue |
1-2 |
Pages |
99-119 |
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0038-6308 |
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no |
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RPLAB @ s @ |
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443 |
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| Author |
Gross, Rudolf; Marx, Achim |
| Title |
Applied superconductivity: Josephson effect and superconducting electronics. Chapter 7 |
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Book Chapter |
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2005 |
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Walther-Meißner-Institut |
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498 |
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Кошелец, В. П.; Дмитриев, П. Н.; Ермаков, А. Б.; Филиппенко, Л. В.; Корюкин, О. В.; Торгашин, М. Ю.; Худченко, А. В. |
| Title |
Интегральный сверхпроводниковый спектрометр |
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Journal Article |
| Year |
2005 |
Publication |
Известия вузов. Радиофизика |
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48 |
Issue |
10-11 |
Pages |
947-954 |
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SIR |
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russian |
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518 |
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Финкель, М. И.; Масленников, С. Н.; Гольцман, Г. Н. |
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Супергетеродинные терагерцовые приёмники со сверхпроводниковым смесителем на электронном разогреве |
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Journal Article |
| Year |
2005 |
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Известия высших учебных заведений. Радиофизика |
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48 |
Issue |
10 |
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964-970 |
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russian |
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Duplicated as 381 |
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380 |
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Корнеев, А. А.; Минаева, О.; Рубцова, И.; Милостная, И.; Чулкова, Г.; Воронов, Б.; Смирнов, К.; Селезнёв, В.; Гольцман, Г.; Pearlman, A.; Slysz, W.; Cross, A.; Alvarez, P.; Верёвкин, А.; Sobolewski, R. |
| Title |
Сверхпроводящий однофотонный детектор на основе ультратонкой пленки NbN |
Type |
Journal Article |
| Year |
2005 |
Publication |
Квантовая электроника |
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35 |
Issue |
8 |
Pages |
698-700 |
| Keywords |
NbN SSPD, SNSPD |
| Abstract |
Представлены результаты исследований сверхпроводящих однофотонных детекторов, изготовленных из ультратонкой пленки NbN. Развитие технологического процесса изготовления детекторов, а также снижение рабочей температуры до 2 К позволили существенно увеличить квантовую эффективность: для видимого света (λ = 0.56 мкм) она составила 30%–40%, т.е. достигла предела, определяемого коэффициентом поглощения пленки. С ростом длины волны квантовая эффективность экспоненциально падает, составляя ~20% на λ=1.55 мкм и ~0.02% на λ = 5 мкм. При скорости темнового счета ~10-4s-1 экспериментально измеренная эквивалентная мощность шума составила 1.5 × 10-20 Вт/Гц-1/2; в дальнейшем она может быть уменьшена до рекордно низкого значения 5 × 10-21 Вт/Гц-1/2. Временное разрешение детектора равно 30 пс. |
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Duplicated as 383 (Superconducting single-photon ultrathin NbN film detector) |
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382 |
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| Author |
Лудков, Денис Николаевич |
| Title |
Терагерцовые смесители на горячих электронах из тонких сверхпроводниковых пленок NbN и NbTiN |
Type |
Manuscript |
| Year |
2005 |
Publication |
М. МПГУ |
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HEB, detector, mixer |
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Ph.D. thesis |
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479 |
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Тарасов, М.; Кузьмин, Л. |
| Title |
Концепция смесителя на основе болометра на холодных электронах |
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Journal Article |
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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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no |
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545 |
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