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Author | Флоря, И.Н.; Корнеева, Ю.П.; Корнеев, А.А.; Гольцман, Г.Н. | ||||
Title | Сверхпроводниковый однофотонный детектор для среднего инфракрасного диапазона на основе узких параллельных полосок | Type | Journal Article | ||
Year | 2011 | Publication | Труды Московского физико-технического института | Abbreviated Journal | Труды МФТИ |
Volume | 3 | Issue | 2 | Pages | 14-17 |
Keywords | SSPD | ||||
Abstract | Мы рассматриваем ультрабыстрый сверхпроводниковый однофотонный детектор (SSPD). SSPD представляет собой тонкопленочную наноструктуру — очень узкую и длинную полоску сверхпроводника, изогнутую в виде меандра, изготовленную из пленки NbN толщиной 4 нм, нанесенной на сапфировую подложку. SSPD хорошо сопрягается с оптоволокном и легко может быть интегрирован в полностью готовую для работы приемную систему. В стремлении продвинуться в средний ИК диапозон нам удалось разработать SSPD в виде параллельно соединенных полосок с шириной полоски всего 50 нм и сохранить при этом сверхпроводящие свойства. Эти детекторы показывают более чем на порядок большую чувствительность на длине волны 3;5 мкм, чем SSPD в виде меандра. Полученные результаты открывают путь к эффективным детекторам среднего ИК-диапазона, обладающим скоростью счета свыше 1 ГГц. | ||||
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Call Number | RPLAB @ gujma @ | Serial | 706 | ||
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Author | Пентин, И. В.; Смирнов, К. В.; Вахтомин, Ю. Б.; Смирнов, А. В.; Ожегов, Р. В.; Дивочий, А. В.; Гольцман, Г. Н. | ||||
Title | Быстродействующий терагерцевый приемник и инфракрасный счетчик одиночных фотонов на эффекте разогрева электронов в сверхпроводниковых тонкопленочных наноструктурах | Type | Journal Article | ||
Year | 2011 | Publication | Труды МФТИ | Abbreviated Journal | Труды МФТИ |
Volume | 3 | Issue | 2 | Pages | 38-42 |
Keywords | SSPD, SNSPD, HEB | ||||
Abstract | Представлены результаты создания приемных систем терагерцевого диапазона (0.3-70 ТГц), обладающих рекордным быстродействием (50 пс) и высокой чувствительностью (до 5x 10^(-14) Вт/Гц^(1/2)), а также однофотонных приемных систем ближнего инфракрасного диапазона с квантовой эффективностью 25 %, уровнем темнового счета 10-1c., максимальной скоростью счета ~ 100 МГц и временным разрешением до 50 пс. | ||||
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Call Number | RPLAB @ gujma @ | Serial | 707 | ||
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Author | Расулова, Г.К.; Брунков, П.Н.; Пентин, И.В.; Ковалюк, В.В.; Горшков, К.Н.; Казаков, А.Ю.; Иванов, С.Ю.; Егоров, А.Ю.; Саксеев, Д.А.; Конников, С.Г. | ||||
Title | Взаимная синхронизация двух связанных генераторов автоколебаний на основе сверхрешеток GaAs/AlGaAs | Type | Journal Article | ||
Year | 2011 | Publication | Журнал технической физики | Abbreviated Journal | ЖТФ |
Volume | 81 | Issue | 6 | Pages | 80-86 |
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Abstract | Проведено исследование взаимодействия генераторов автоколебаний на основе 30-периодной слабосвязанной сверхрешетки GaAs/AlGaAs. Воздействие одного генератора автоколебаний на другой осуществлялось при заданном постоянном смещении в отсутствие в одном из них генерации автономных колебаний. Показано, что вынужденные колебания в захватывающем генераторе возникают из-за возбуждения колебаний в системе связанных осцилляторов, образующих границу электрополевого домена на частоте одной из высших гармоник вынуждающего колебания. | ||||
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Call Number | RPLAB @ gujma @ | Serial | 711 | ||
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Author | Mitin, Vladimir; Antipov, Andrei; Sergeev, Andrei; Vagidov, Nizami; Eason, David; Strasser, Gottfried | ||||
Title | Quantum Dot Infrared Photodetectors: Photoresponse Enhancement Due to Potential Barriers | Type | Journal Article | ||
Year | 2011 | Publication | Nanoscale Research Letters | Abbreviated Journal | Nanoscale res lett |
Volume | 6 | Issue | 1 | Pages | 6 |
Keywords | Quantum dots; Infrared detectors; Photoresponse; Doping; Potential barriers; Capture processes | ||||
Abstract | Potential barriers around quantum dots (QDs) play a key role in kinetics of photoelectrons. These barriers are always created, when electrons from dopants outside QDs fill the dots. Potential barriers suppress the capture processes of photoelectrons and increase the photoresponse. To directly investigate the effect of potential barriers on photoelectron kinetics, we fabricated several QD structures with different positions of dopants and various levels of doping. The potential barriers as a function of doping and dopant positions have been determined using nextnano3 software. We experimentally investigated the photoresponse to IR radiation as a function of the radiation frequency and voltage bias. We also measured the dark current in these QD structures. Our investigations show that the photoresponse increases ~30 times as the height of potential barriers changes from 30 to 130 meV. | ||||
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Call Number | RPLAB @ gujma @ | Serial | 712 | ||
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Author | Семенов, А. В.; Девятов, И. А.; Рябчун, С. А.; Масленников, С. Н.; Масленникова, А. С.; Ларионов, П. А.; Воронов, Б. М.; Чулкова, Г. М. | ||||
Title | Поглощение терагерцового электромагнитного излучения в “грязной” сверхпроводниковой пленке при произвольном виде спектральных функций | Type | Journal Article | ||
Year | 2011 | Publication | Ж. Радиоэлектрон. | Abbreviated Journal | |
Volume | 10 | Issue | Pages | 7 | |
Keywords | terahertz electromagnetic radiation; superconductors; detectors of terahertz range | ||||
Abstract | A problem of absorption of high-frequency electromagnetic field in dirty superconductor is treated within Keldysh technic. Expression for the source term in the kinetic equation for quasiparticle distribution function is derived. The result is significant for deriving a consistent microscopic theory of superconducting detectors for terahertz frequency range, perspective detectors on kinetic inductance of current-biased superconducting strip and on Josephson inductance of tunnel. В технике Келдыша рассмотрена задача о поглощении мощности высокочастотного электромагнитного поля в сверхпроводнике, удовлетворяющем условию грязного предела. Получено выражение для члена источника в кинетическом уравнении для функции распределения квазичастиц, справедливое при произвольном виде спектральных функций. Этот результат имеет значение для развития последовательной микроскопической теории сверхпроводниковых детекторов излучения терагерцового диапазона, в частности, перспективных детекторов на кинетической индуктивности смещённой током сверхпроводниковой полоски и джозефсоновской индуктивности туннельного контакта. |
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Notes | Duplicated as 1117 | Approved | no | ||
Call Number | RPLAB @ gujma @ | Serial | 713 | ||
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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 | Tretyakov, Ivan; Ryabchun, Sergey; Finkel, Matvey; Maslennikov, Sergey; Maslennikova, Anna; Kaurova, Natalia; Lobastova, Anastasia; Voronov, Boris; Gol'tsman, Gregory | ||||
Title | Ultrawide noise bandwidth of NbN hot-electron bolometer mixers with in situ gold contacts | Type | Journal Article | ||
Year | 2011 | Publication | IEEE Trans. Appl. Supercond. | Abbreviated Journal | |
Volume | 21 | Issue | 3 | Pages | 620-623 |
Keywords | NbN HEB mixer bandwidth | ||||
Abstract | We report a noise bandwidth of 7 GHz in the new generation of NbN hot-electron bolometer (HEB) mixers that are being developed for the space observatory Millimetron. The HEB receiver driven by a 2.5-THz local oscillator offered a noise temperature of 600 K in a 50-MHz final detection bandwidth. As the filter center frequency was swept this value remained nearly constant up to the cutoff frequency of the cryogenic amplifier at 7 GHz. We believe that such a low value of the noise temperature is due to reduced radio frequency (RF) loss at the interface between the superconducting film and the gold contacts. We have also performed gain bandwidth measurements at the superconducting transition on HEB mixers with various lengths and found them to be in excellent agreement with the results of the analytical and numerical models developed for the HEB mixer with both diffusion and phonon cooling of hot electrons. | ||||
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Call Number | RPLAB @ gujma @ | Serial | 716 | ||
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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 | Lobanov, Y.; Tong, E.; Blundell, R.; Hedden, A.; Voronov, B.; Gol'tsman, G. | ||||
Title | Large-signal frequency response of an HEB mixer: from 300 MHz to terahertz | Type | Journal Article | ||
Year | 2011 | Publication | IEEE Trans. Appl. Supercond. | Abbreviated Journal | |
Volume | 21 | Issue | 3 | Pages | 628-631 |
Keywords | waveguide NbN HEB mixers | ||||
Abstract | We present a study of the large signal frequency response of an HEB mixer over a wide frequency range. In our experiments, we have subjected the HEB mixer to incident electromagnetic radiation from 0.3 GHz to 1 THz. The mixer element is an NbN film deposited on crystalline quartz. The mixer chip is mounted in a waveguide cavity, coupled to free space with a diagonal horn. At microwave frequencies, electromagnetic radiation is applied through the coaxial bias port of the mixer block. At higher frequencies the input signal passes via the diagonal horn feed. At each frequency, the incident power is varied and a family of I-V curves is recorded. From the curves we identify 3 distinct regimes of operation of the mixer separated by the phonon relaxation frequency and the superconducting energy gap frequency observed at about 3 GHz and 660 GHz respectively. In this paper, we will present observed curves and discuss the results of our experiment. | ||||
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Call Number | RPLAB @ gujma @ | Serial | 719 | ||
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Author | Lobanov, Y.V.; Tong, C.-Y.E.; Hedden, A.S.; Blundell, R.; Voronov, B.M.; Gol'tsman, G.N. | ||||
Title | Direct measurement of the gain and noise bandwidths of HEB mixers | Type | Journal Article | ||
Year | 2011 | Publication | IEEE Trans. Appl. Supercond. | Abbreviated Journal | IEEE Trans. Appl. Supercond. |
Volume | 21 | Issue | 3 | Pages | 645-648 |
Keywords | waveguide NbN HEB mixers | ||||
Abstract | The intermediate frequency (IF) bandwidth of a hot electron bolometer (HEB) mixer is an important parameter of the mixer, in that it helps to determine its suitability for a given application. With the availability of wideband low noise amplifiers, it is simple to measure the performance of an HEB mixer over a wide range of IF at a fixed LO frequency using the standard Y-factor method. This in-situ method allows us to measure both the gain and noise bandwidths simultaneously. We have also measured mixer output impedance with a vector network analyser. Intrinsic time constant has been extracted from the impedance data and compared to the mixer's bandwidths determined from receiver Y-factor measurement. | ||||
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Call Number | RPLAB @ gujma @ | Serial | 720 | ||
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