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Lobanov, Y.V.; Tong, C.-Y.E.; Hedden, A.S.; Blundell, R.; Voronov, B.M.; Gol'tsman, G.N. |
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Title |
Direct measurement of the gain and noise bandwidths of HEB mixers |
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2011 |
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IEEE Trans. Appl. Supercond. |
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IEEE Trans. Appl. Supercond. |
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21 |
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3 |
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645-648 |
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waveguide NbN HEB mixers |
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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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RPLAB @ gujma @ |
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Васильева, И. А.; Компанеец, В. В.; Красная, Ж. А.; Чижикова, З. А. |
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Проявление внутримолекулярных вибронных взаимодействий в тонкоструктурных спектрах флуоресценции и возбуждения флуоресценции полиеновых δ-диметиламинокетонов |
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2011 |
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Оптический журнал |
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Опт. ж. |
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78 |
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5 |
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3-8 |
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спектры флуоресценции; вибрационный анализ; адиабатическое гармоническое приближение; бесфононная линия; фононное крыло |
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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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RPLAB @ gujma @ |
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721 |
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Ожегов, Роман Викторович |
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Флуктуационная чувствительность и стабильность приемников с СИС и HEB смесителями для терагерцового тепловидения |
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2011 |
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Радиофизика |
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135 |
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HEB |
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RPLAB @ gujma @ |
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731 |
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Чулкова, Г. М.; Семенов, А. В.; Корнеев, А. А.; Кардакова, А. И.; Аверьев, Н. В.; Ан, П. П.; Казаков, А. Ю.; Трифонов, А. В. |
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Спектральная чувствительность сверхпроводникового однофотонного детектора |
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2011 |
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Журнал радиоэлектроники |
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Ж. радиоэлектрон. |
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11 |
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5 |
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SSPD; quantum efficiency; spectral sensitivity |
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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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RPLAB @ gujma @ |
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844 |
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Rasulova, G. K.; Brunkov, P. N.; Pentin, I. V.; Kovalyuk, V. V.; Gorshkov, K. N.; Kazakov, A. Y.; Ivanov, S. Y.; Egorov, A. Y.; Sakseev, D. A.; Konnikov, S. G. |
![goto web page (via DOI) doi](img/doi.gif)
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Mutual synchronization of two coupled self-oscillators based on GaAs/AlGaAs superlattices |
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2011 |
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Tech. Phys. |
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Tech. Phys. |
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56 |
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6 |
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826-830 |
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GaAs/AlGaAs superlattices |
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The interaction of self-oscillators based on 30-period weakly coupled GaAs/AlGaAs superlattices is studied. The action of one self-oscillator on the other was observed for a constant bias voltage in the absence of generation of self-sustained oscillations in one of the oscillators. It is shown that induced oscillations in a forced oscillator appear due to excitation of oscillations in the system of coupled oscillators forming the electric-field domain wall at the frequency of one of the higher harmonics of a forcing oscillation. |
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1063-7842 |
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1214 |
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Чулкова, Г. М.; Семёнов, А. В.; Дивочий, А. В.; Тархов, М. А. |
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Сверхпроводниковый однофотонный детектор с разрешением числа фотонов для систем дальней телекоммуникационной связи |
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2011 |
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Ж. радиоэлектрон. |
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Ж. радиоэлектрон. |
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12 |
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1-6 |
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PNR SSPD, SNSPD |
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Рассмотрена возможность применения сверхпроводникового однофотонного детектора, разрешающего число фотонов, в качестве датчика приёмных модулей телекоммуникационных линий. Показано, что для достижения доли ошибочных битов на уровне 10-11 достаточно на два порядка меньшей мощности в оптическом импульсе, чем при использовании существующих приёмных модулей. |
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RPLAB @ sasha @ чулковасверхпроводниковый |
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1031 |
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Semenov, A. V.; Devyatov, I. A.; Ryabchun, S. A.; Maslennikov, S. N.; Maslennikova, A. S.; Larionov, P. A.; Voronov, B. M.; Chulkova, G. M. |
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Title |
Absorption of terahertz electromagnetic radiation in dirty superconducting film at arbitrary type of the spectral functions |
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2011 |
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Rus. J. Radio Electron. |
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Rus. J. Radio Electron. |
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terahertz electromagnetic radiation; superconductors; detectors of terahertz range |
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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. |
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7 pages |
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1117 |
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Korneeva, Yu. P.; Trifonov, A. V.; Vakhtomin, Yu. B.; Smirnov, K. V. |
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Design of resonator for superconducting single-photon detector |
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2011 |
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Rus. J. Radio Electron. |
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Rus. J. Radio Electron. |
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12 |
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SSPD optical resonator, SNSPD |
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A resonator for superconducting single-photon detector is designed. Near 60% coupling with a radiation propagating from a dielectric substrate of optical fiber is demonstrated to be achieved for typical values of the detector’s film sheet resistance. |
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Zhang, W.; Miao, W.; Yao, Q. J.; Lin, Z. H.; Shi, S. C.; Gao, J. R.; Goltsman, G. N. |
![goto web page (via DOI) doi](img/doi.gif)
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Spectral response and noise temperature of a 2.5 THz spiral antenna coupled NbN HEB mixer |
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2012 |
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Phys. Procedia |
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Phys. Procedia |
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36 |
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334-337 |
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NbN HEB mixer |
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We report on a 2.5 THz spiral antenna coupled NbN hot electron bolometer (HEB) mixers, fabricated with in-situ process. The receiver noise temperature with lowest value of 1180 K is in good agreement with calculated quantum efficiency factor as a function of bias voltage. In addition, the measured spectral response of the spiral antenna coupled NbN HEB mixer shows broad frequency coverage of 0.8-3 THz, and corrected response for optical losses, FTS, and coupling efficiency between antenna and bolometer falls with frequency due to diffraction-limited beam of lens/antenna combination. |
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Tuchak, A. N.; Gol’tsman, G. N.; Kitaeva, G. K.; Penin, A. N.; Seliverstov, S. V.; Finkel, M. I.; Shepelev, A. V.; Yakunin, P. V. |
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Generation of nanosecond terahertz pulses by the optical rectification method |
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2012 |
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JETP Lett. |
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JETP Lett. |
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96 |
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2 |
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94-97 |
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optical rectification, lithium niobate crystal |
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The possibility of the generation of quasi-cw terahertz radiation by the optical rectification method for broad-band Fourier unlimited nanosecond laser pulses has been experimentally demonstrated. The broadband radiation of a LiF dye-center laser is used as a pump source of a nonlinear optical oscillator. The energy efficiency of terahertz optical frequency conversion in a periodically polarized lithium niobate crystal is 4 × 10−9 at a pump power density of 7 MW/cm2. |
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0021-3640 |
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