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| Author | Семенов, А. В.; Девятов, И. А.; Третьяков, И. В.; Лобанов, Ю. В.; Ожегов, Р. В.; Петренко, Д. В.; Селиверстов, С. В.; Финкель, М. И. | ||||
| Title | Вывод уравнения типа уравнения гинзбурга-ландау для нанопроволоки вблизи критического магнитного поля | Type | Journal Article | ||
| Year | 2011 | Publication | Журнал радиоэлектроники | Abbreviated Journal | Ж. радиоэлектроники |
| Volume | 11 | Issue | Pages | 4 | |
| Keywords | superconductivity; nanowire; Ginzburg-Landau equation | ||||
| Abstract | Nonlinear Ginzburg-Landau equation for dirty supercondicting 1D wire is derived in the limit of high magnetic field. В пределе больших магнитных полей выведено нелинейное уравнение Гинзбурга-Ландау, описывающее состояние одномерной «грязной» нанопроволоки. |
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| Call Number | RPLAB @ gujma @ | Serial | 714 | ||
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| Author | Гольцман, Г. Н.; Разумовская, И. В.; Окунев, О. В; Чулкова, Г. М.; Корнеев, А. А.; Финкель, М. И.; Масленников, С. Н.; Семенов, А. В.; Александров, В. Н. | ||||
| Title | Сборник программ учебных дисциплин профессионального цикла подготовки магистров и бакалавров по направлению «Физика» | Type | Journal Article | ||
| Year | 2011 | Publication | Прометей | Abbreviated Journal | Прометей |
| Volume | Issue | Pages | 67 | ||
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| Notes | Учебное пособие | Approved | no | ||
| Call Number | RPLAB @ gujma @ | Serial | 717 | ||
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| Author | Смирнов, Андрей Владимирович | ||||
| Title | Исследование полосы преобразования терагерцовых смесителей на эффекте электронного разогрева в NbZr, NbN и в одиночном гетеропереходе AlGaAs/GaAs | Type | Manuscript | ||
| Year | 2009 | Publication | Радиофизика | Abbreviated Journal | Радиофиз. |
| Volume | Issue | Pages | 139 | ||
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| Notes | Диссертация | Approved | no | ||
| Call Number | RPLAB @ gujma @ | Serial | 718 | ||
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| Author | Васильева, И. А.; Компанеец, В. В.; Красная, Ж. А.; Чижикова, З. А. | ||||
| Title | Проявление внутримолекулярных вибронных взаимодействий в тонкоструктурных спектрах флуоресценции и возбуждения флуоресценции полиеновых δ-диметиламинокетонов | Type | Journal Article | ||
| Year | 2011 | Publication | Оптический журнал | Abbreviated Journal | Опт. ж. |
| Volume | 78 | Issue | 5 | Pages | 3-8 |
| Keywords | спектры флуоресценции; вибрационный анализ; адиабатическое гармоническое приближение; бесфононная линия; фононное крыло | ||||
| Abstract | Проведен вибрационный анализ спектров флуоресценции и возбуждения флуоресценции, полученных методом Шпольского при 4,2 K. Рассчитаны параметры внутримолекулярных взаимодействий двух δ-диметиламинокетонов. Для определения интегральных интенсивностей вибронных полос в спектрах с тонкой структурой на интенсивном сплошном фоне выполнено моделирование спектров путем представления полосы каждого из вибронных переходов бесфононной линией и фононным крылом с определенными параметрами (полуширинами, фактором Дебая–Валлера). Показано, что нарушение зеркальной симметрии в сопряженных спектрах флуоресценции и возбуждения флуоресценции этих двух соединений может быть обÑŠяснено интерференцией франк-кондоновского и герцберг-теллеровского взаимодействий. | ||||
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| Call Number | RPLAB @ gujma @ | Serial | 721 | ||
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| Author | Lobanov, Y. V.; Tong, Cheuk-Yu E.; Hedden, A. S.; Blundell, R.; Gol'tsman, G. N. | ||||
| Title | Microwave-assisted슠measurement슠of the슠frequency슠response슠of슠terahertz슠HEB슠mixers슠with a슠fourier슠transform슠spectrometer | Type | Conference Article | ||
| Year | 2010 | Publication | 21st International Symposium on Space Terahertz Technology | Abbreviated Journal | 21st ISSTT |
| Volume | Issue | Pages | 420-423 | ||
| Keywords | HEB mixer | ||||
| Abstract | We describe a novel method of operation of the HEB direct detector for use with a Fourier Transform Spectrometer. Instead of elevating the bath temperature, we have measured the RF response of waveguide HEB mixers by applying microwave radiation to select appropriate bias conditions. In our experiment, a microwave signal is injected into the HEB mixer via its IF port. By choosing an appropriate injection level, the device can be operated close to the desired operating point. Furthermore, we have shown that both thermal biasing and microwave injection can reproduce the same spectral response of the HEB mixer. However, with the use of microwave injection, there is no need to wait for the mixer to reach thermal equilibrium, so characterisation can be done in less time. Also, the liquid helium consumption for our wet cryostat is also reduced. We have demonstrated that the signalto-noise ratio of the FTS measurements can be improved with microwave injection. | ||||
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| Call Number | RPLAB @ gujma @ | Serial | 725 | ||
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| Author | Ожегов, Р.В.; Окунев, О.В.; Гольцман, Г.Н. | ||||
| Title | Флуктуационная чувствительность сверхпроводящего болометрического смесителя на эффекте разогрева электронного газа | Type | Journal Article | ||
| Year | 2009 | Publication | Радиотехника | Abbreviated Journal | |
| Volume | Issue | 3 | Pages | 120-124 | |
| Keywords | смеситель на горячих электронах; флуктуационная чувствительность; тепловизор терагерцевого диапазона частот; hot-electron bolometer mixer; Imaging system; Noise equivalent temperature difference; Heterodyne receiver; Terahertz range | ||||
| Abstract | Interest in research in the terahertz range is driven by a great number of various applications, where terahertz instruments may play a leading role. To name just a few, such applications include study of the cosmic microwave background radiation and the distribution of the dark matter, medicine, navigation, fire alarm, security systems and environmental monitoring. The paper discusses the possibility of using a receiver based on the hot-electron effect in superconducting films as an imaging system. We present the results of the noise equivalent temperature difference (NETD) measurements performed with a hot-electron bolometer mixer made from a thin superconducting film. The receiver with a noise temperature of ~ 3800 K at a local oscillator frequency of 300 GHz a bandwidth of 500 MHz and an integration time of 1 s has offered an NETD of 0.5 K. We have also developed a technique that enabled us to reduce the contribution of the mixer gain fluctuations to the overall system instability. As of this writing, the above value of the NETD is the lowest value offered for this type of receiver, which indicates the possibility to use such receivers in real-time imaging systems. The technique offered in the paper for achieving the limiting value of the NETD offers an alternative to the phase-locking scheme. Представены результаты измерения флуктуационной чувствительности (NETD – noise equivalent temperature difference) болометрического смесителя на эффекте разогрева электронного газа в тонких сверхпроводящих пленках. Получено предельное значение NETD, равное 0,5 К, при шумовой температуре приемника 3800 К, ширине полосы преобразования 500 МГц, постоянной времени 1 с и частоте гетеродина 300 ГГц. Разработана методика достижения предельной флуктуационной чувствительности, позволяющая избежать влияния нестабильности коэффициента преобразования смесителя. |
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| Call Number | RPLAB @ gujma @ | Serial | 728 | ||
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| Author | Ожегов, Роман Викторович | ||||
| Title | Флуктуационная чувствительность и стабильность приемников с СИС и HEB смесителями для терагерцового тепловидения | Type | Journal Article | ||
| Year | 2011 | Publication | Радиофизика | Abbreviated Journal | |
| Volume | Issue | Pages | 135 | ||
| Keywords | HEB | ||||
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| Call Number | RPLAB @ gujma @ | Serial | 731 | ||
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| Author | Чулкова, Г. М.; Семенов, А. В.; Корнеев, А. А.; Кардакова, А. И.; Аверьев, Н. В.; Ан, П. П.; Казаков, А. Ю.; Трифонов, А. В. | ||||
| Title | Спектральная чувствительность сверхпроводникового однофотонного детектора | Type | Journal Article | ||
| Year | 2011 | Publication | Журнал радиоэлектроники | Abbreviated Journal | Ж. радиоэлектрон. |
| Volume | 11 | Issue | Pages | 5 | |
| Keywords | SSPD; quantum efficiency; spectral sensitivity | ||||
| Abstract | We consider quantum efficiency dependence on photons' energy from hot spot model. Direction of quasiparticles diffusion drive across superconductive film. The maximal quantum efficiency is proportional to a probability of photon absorption. The spectral sensitivity of superconductive single photon detector does not have clearly expressed red limit. Changing regimes of work depends on a wavelength we can get high values of quantum efficiency in visible and infrared range which will be specified by the quality of fabrication of detectors and their consistency with the radiation. Key words: superconducting single-photon detector, SSPD, quantum efficiency, spectral sensitivity. В статье представлена зависимость квантовой эффективности от энергии фотона в рамках модели горячего пятна. Диффузия квазичастиц происходит в основном перпендикулярно направлению тока в областях с максимальной плотностью тока. Максимальная квантовая эффективность детектора пропорциональна вероятности поглощения фотона. Несмотря на квантовый характер работы сверхпроводникового однофотонного детектора, он не имеет четко выраженной красной границы. Изменяя режим работы в зависимости от длины волны можно в видимом и инфракрасном диапазонах получать высокие значения квантовой эффективности, которые будут определяться лишь качеством изготовления детекторов и степенью их согласования с излучением. |
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| Call Number | RPLAB @ gujma @ | Serial | 844 | ||
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| Author | Shurakov, Alexander; Tong, Edward; Blundell, Raymond; Gol'tsman, Gregory | ||||
| Title | Microwave stabilization of HEB mixer by a microchip controller | Type | Conference Article | ||
| Year | 2012 | Publication | IEEE MTT-S international microwave symposium digest | Abbreviated Journal | |
| Volume | Issue | Pages | 1-3 | ||
| Keywords | HEB mixer stability, microwave injection, Allan variance, Allan time | ||||
| Abstract | The stability of a Hot Electron Bolometer (HEB) mixer can be improved by the use of microwave injection. In this article we report a refinement of this approach. We introduce a microchip controller to facilitate the implementation of the stabilization scheme, and demonstrate that the feedback loop effectively suppresses drifts in the HEB bias current, leading to an improvement in the receiver stability. The measured Allan time of the mixer's IF output power is increased to > 10 s. | ||||
| Address | Montreal, QC, Canada | ||||
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| Call Number | Serial | 857 | |||
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| Author | Elant'ev, A. I.; Karasik, B. S. | ||||
| Title | Effect of high-frequency current on Nb superconductive film in resistive state | Type | Journal Article | ||
| Year | 1989 | Publication | Sov. J. Low Temp. Phys. | Abbreviated Journal | Sov. J. Low Temp. Phys. |
| Volume | 15 | Issue | 7 | Pages | 379-383 |
| Keywords | Nb HEB | ||||
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| Call Number | Serial | 882 | |||
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