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Author Ryabchun, Sergey; Tong, Cheuk-Yu Edward; Paine, Scott; Lobanov, Yury; Blundell, Raymond; Goltsman, Gregory doi  openurl
  Title Temperature resolution of an HEB receiver at 810 GHz Type Journal Article
  Year 2009 Publication IEEE Trans. Appl. Supercond. Abbreviated Journal IEEE Trans. Appl. Supercond.  
  Volume 19 Issue 3 Pages 293-296  
  Keywords HEB mixer  
  Abstract We present the results of direct measurements of the temperature resolution of an HEB receiver operating at 810 GHz, in both continuum and spectroscopic modes. In the continuum mode, the input of the receiver was switched between black bodies with different physical temperatures. With a system noise temperature of around 1100 K, the receiver was able to resolve loads which differed in temperature by about 1 K over an integration time of 5 seconds. This resolution is significantly worse than the value of 0.07 K given by the radiometer equation. In the spectroscopic mode, a gas cell filled with carbonyl sulphide (OCS) gas was used and the emission line at 813.3537060 GHz was measured using the receiver in conjunction with a digital spectrometer. From the observed spectra, we determined that the measurement uncertainty of the equivalent emission temperature was 2.8 K for an integration time of 0.25 seconds and a spectral resolution of 12 MHz, compared to a 1.4 K temperature resolution given by the radiometer equation. This relative improvement is due to the fact that at short integration times the contribution from 1/f noise and drift are less dominant. In both modes, the temperature resolution was improved by about 40% with the use of a feedback loop which adjusted the level of an injected microwave radiation to maintain a constant operating current of the HEB mixer. This stabilization scheme has proved to be very effective to keep the temperature resolution of the HEB receiver to close to the theoretical value given by the radiometer equation.  
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  Call Number Serial 636  
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Author Манова, Н.Н.; Корнеева, Ю.П.; Корнеев, А.А.; Слыш, В.; Воронов, Б.М.; Гольцман, Г.Н. openurl 
  Title Сверхпроводниковый NbN однофотонный детектор, интегрированный с четвертьволновым резонатором Type Journal Article
  Year 2011 Publication Письма в Журнал технической физики Abbreviated Journal ПЖТФ  
  Volume 37 Issue 10 Pages 7  
  Keywords SSPD  
  Abstract Исследована спектральная зависимость квантовой эффективности сверхпроводниковых NbN однофотонных детекторов, интегрированных с оптическими четвертьволновыми резонаторами с использованием диэлектриков Si3N4, SiO2, SiO.  
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  Call Number RPLAB @ gujma @ Serial 637  
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Author Tretyakov, Ivan; Ryabchun, Sergey; Finkel, Matvey; Maslennikova, Anna; Kaurova, Natalia; Lobastova, Anastasia; Voronov, Boris; Gol'tsman, Gregory doi  openurl
  Title Low noise and wide bandwidth of NbN hot-electron bolometer mixers Type Journal Article
  Year 2011 Publication Appl. Phys. Lett. Abbreviated Journal Appl. Phys. Lett.  
  Volume 98 Issue Pages 033507 (1 to 3)  
  Keywords NbN HEB mixer  
  Abstract We report a record double sideband noise temperature of 600 K (5hν/kB) offered by a NbN hot-electron bolometer receiver at 2.5 THz. Allowing for standing wave effects, this value was found to be constant in the intermediate frequency range 1–7 GHz, which indicates that the mixer has an unprecedentedly large noise bandwidth in excess of 7 GHz. The insight into this is provided by gain bandwidth measurements performed at the superconducting transition. They show that the dependence of the bandwidth on the mixer length follows the model for an HEB mixer with diffusion and phonon cooling of the hot electrons.  
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  Call Number RPLAB @ gujma @ Serial 638  
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Author Tikhonov, V. V.; Boyarskii, D. A.; Polyakova, O. N.; Dzardanov, A. L.; Goltsman, G. N. url  doi
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  Title Radiophysical and dielectric properties of ore minerals in 12--145 GHz frequency range Type Journal Article
  Year 2010 Publication PIER B Abbreviated Journal PIER B  
  Volume 25 Issue Pages 349-367  
  Keywords complex permittivity, ore minerals  
  Abstract The paper discusses a retrieval technique of complex permittivity of ore minerals in frequency ranges of 12--38 GHz and 77--145 GHz. The method is based on measuring frequency dependencies of transmissivity and reflectivity of plate-parallel mineral samples. In the 12--38 GHz range, the measurements were conducted using a panoramic standing wave ratio and attenuation meter. In the 77--145 GHz range, frequency dependencies of transmissivity and reflectivity were obtained using millimeter-band spectrometer with backward-wave oscillators. The real and imaginary parts of complex permittivity of a mineral were determined solving an equation system for frequency dependencies of transmissivity and reflectivity of an absorbing layer located between two dielectric media. In the course of the work, minerals that are primary ores in iron, zinc, copper and titanium mining were investigated: magnetite, hematite, sphalerite, chalcopyrite, pyrite, and ilmenite.  
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  Call Number RPLAB @ gujma @ Serial 639  
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Author Beck, M.; Klammer, M.; Lang, S.; Leiderer, P.; Kabanov, V. V.; Gol'tsman, G. N.; Demsar, J. doi  openurl
  Title Energy-gap dynamics of superconducting NbN thin films studied by time-resolved terahertz spectroscopy Type Journal Article
  Year 2011 Publication Phys. Rev. Lett. Abbreviated Journal Phys. Rev. Lett.  
  Volume 107 Issue 17 Pages 4  
  Keywords NbN thin film, energy gap dynamics  
  Abstract Using time-domain terahertz spectroscopy we performed direct studies of the photoinduced suppression and recovery of the superconducting gap in a conventional BCS superconductor NbN. Both processes are found to be strongly temperature and excitation density dependent. The analysis of the data with the established phenomenological Rothwarf-Taylor model enabled us to determine the bare quasiparticle recombination rate, the Cooper pair-breaking rate and the electron-phonon coupling constant, λ=1.1±0.1, which is in excellent agreement with theoretical estimates.  
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  Call Number RPLAB @ gujma @ Serial 641  
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Author Шангина, Е. Л.; Смирнов, К. В.; Морозов, Д. В.; Ковалюк, В. В.; Гольцман, Г. Н.; Веревкин, А. А.; Торопов, А. И. openurl 
  Title Концентрационная зависимость полосы преобразования смесителей субмиллиметрового диапазона на основе наноструктур AlGaAs/GaAs Type Journal Article
  Year 2010 Publication Изв. РАН Сер. Физ. Abbreviated Journal Изв. РАН Сер. Физ.  
  Volume 74 Issue 1 Pages 110-112  
  Keywords 2DEG AlGaAs/GaAs heterostructures, THz heterodyne detectors, IF bandwidth  
  Abstract Методом субмиллиметровой спектроскопии с высоким временным разрешением при Т = 4.2 К измерена концентрационная зависимость полосы преобразования гетеродинного детектирования гетероструктур AlGaAs/GaAs с двумерным электронным газом. С увеличением концентрации двумерных электронов ns = (1.6–6.6) · 1011см-2 ширина полосы преобразования f3dB уменьшается от 245 до 145 МГц. В исследованной области концентраций наблюдается зависимость f3dB , обусловленная рассеянием электронов на деформационном потенциале акустических фононов и пьезоэлектрическим рассеянием.  
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  Language Russian Summary Language Original Title  
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  Notes Duplicated as 1217 Approved no  
  Call Number RPLAB @ gujma @ Serial 642  
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Author Korneeva, Y.; Florya, I.; Semenov, A.; Korneev, A.; Goltsman, G. doi  openurl
  Title New generation of nanowire NbN superconducting single-photon detector for mid-infrared Type Journal Article
  Year 2011 Publication IEEE Trans. Appl. Supercond. Abbreviated Journal IEEE Trans. Appl. Supercond.  
  Volume 21 Issue 3 Pages 323-326  
  Keywords SSPD  
  Abstract We present a break-through approach to mid-infrared single-photon detection based on nanowire NbN superconducting single-photon detectors (SSPD). Although SSPD became a mature technology for telecom wavelengths (1.3-1.55 μm) its further expansion to mid-infrared wavelength was hampered by low sensitivity above 2 μm. We managed to overcome this limit by reducing the nanowire width to 50 nm, while retaining high superconducting properties and connecting the wires in parallel to produce a voltage response of sufficient magnitude. The new device exhibits 10 times better quantum efficiency at 3.5 μm wavelength than the “standard” SSPD.  
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  Call Number RPLAB @ gujma @ Serial 644  
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Author Ларионов, П.А.; Рябчун, С.А.; Финкель, М.И.; Гольцман, Г.Н. openurl 
  Title Вывешенный сверхпроводящий детектор терагерцового диапазона Type Journal Article
  Year 2011 Publication Труды Московского физико-технического института Abbreviated Journal Труды МФТИ  
  Volume 3 Issue 2 Pages 29-30  
  Keywords вывешенный болометр, терагерцовый диапазон, сверхпроводящие пленки  
  Abstract Рассматриваются технологические особенности создания чувствительного вывешен- ного детектора терагерцевого диапазона на основе плёнки MoRe. Предлагается воз- можный маршрут создания такого детектора и поясняется выбор материалов, ис- пользуемых для создания детектора.  
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  Call Number RPLAB @ gujma @ Serial 645  
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Author Масленникова, А. В.; Рябчун, С. А.; Финкель, М. И.; Каурова, Н. С.; Исупова, А. А.; Воронов, Б. М.; Гольцман, Г. Н. openurl 
  Title Широкополосные смесители на горячих электронах на основе NbN наноструктур Type Journal Article
  Year 2011 Publication Труды Московского физико-технического института Abbreviated Journal Труды МФТИ  
  Volume 3 Issue 2 Pages 31-34  
  Keywords HEB mixer  
  Abstract Мы приводим данные исследования полосы преобразования смесителей на горячих электронах (hot-electron bolometer, НЕВ), изготовленных на основе тонких пленок NbN. Зависимость полосы преобразования от длины смесительного элемента находится в прекрасном согласии с результатами теоретической модели HEB-смесителя, в котором энергетическая релаксация электронов одновременно происходит по двум каналам: фононному и диффузионному.  
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  Call Number RPLAB @ gujma @ Serial 646  
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Author Mohan, Nishant; Minaeva, Olga; Goltsman, Gregory N.; Saleh, Mohammed F.; Nasr, Magued B.; Sergienko, Alexander V.; Saleh, Bahaa E.; Teich, Malvin C. url  doi
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  Title Ultrabroadband coherence-domain imaging using parametric downconversion and superconducting single-photon detectors at 1064 nm Type Journal Article
  Year 2009 Publication Appl. Opt. Abbreviated Journal Appl. Opt.  
  Volume 48 Issue 20 Pages 4009–4017  
  Keywords SSPD, SNSPD, SPAD  
  Abstract Coherence-domain imaging systems can be operated in a single-photon-counting mode, offering low detector noise; this in turn leads to increased sensitivity for weak light sources and weakly reflecting samples. We have demonstrated that excellent axial resolution can be obtained in a photon-counting coherence-domain imaging (CDI) system that uses light generated via spontaneous parametric downconversion (SPDC) in a chirped periodically poled stoichiometric lithium tantalate (chirped-PPSLT) structure, in conjunction with a niobium nitride superconducting single-photon detector (SSPD). The bandwidth of the light generated via SPDC, as well as the bandwidth over which the SSPD is sensitive, can extend over a wavelength region that stretches from 700 to 1500 nm. This ultrabroad wavelength band offers a near-ideal combination of deep penetration and ultrahigh axial resolution for the imaging of biological tissue. The generation of SPDC light of adjustable bandwidth in the vicinity of 1064 nm, via the use of chirped-PPSLT structures, had not been previously achieved. To demonstrate the usefulness of this technique, we construct images for a hierarchy of samples of increasing complexity: a mirror, a nitrocellulose membrane, and a biological sample comprising onion-skin cells.  
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  Call Number RPLAB @ gujma @ Serial 652  
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Author Pernice, W.; Schuck, C.; Li, M.; Goltsman, G. N.; Sergienko, A. V.; Tang, H. X. openurl 
  Title High speed travelling wave single-photon detectors with near-unity quantum efficiency Type Journal Article
  Year 2011 Publication arXiv Abbreviated Journal arXiv  
  Volume Issue Pages 1-14  
  Keywords SPD  
  Abstract Ultrafast, high quantum efficiency single photon detectors are among the most sought-after elements in modern quantum optics and quantum communication. Close-to-unity photon detection efficiency is essential for scalable measurement-based quantum computation, quantum key distribution, and loophole-free Bell experiments. However, imperfect modal matching and finite photon absorption rates have usually limited the maximum attainable detection efficiency of single photon detectors. Here we demonstrate a superconducting nanowire detector atop nanophotonic waveguides and achieve single photon detection efficiency up to 94% at telecom wavelengths. Our detectors are fully embedded in a scalable, low loss silicon photonic circuit and provide ultrashort timing jitter of 18ps at multi-GHz detection rates. Exploiting this high temporal resolution we demonstrate ballistic photon transport in silicon ring resonators. The direct implementation of such a detector with high quantum efficiency, high detection speed and low jitter time on chip overcomes a major barrier in integrated quantum photonics.  
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  Publisher Place of Publication arXiv:1108.5299 Editor  
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  Call Number RPLAB @ gujma @ Serial 661  
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Author Manova, N. N.; Korneeva, Yu. P.; Korneev, A. A.; Slysz, W.; Voronov, B. M.; Gol'tsman, G. N. url  doi
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  Title Superconducting NbN single-photon detector integrated with quarter-wave resonator Type Journal Article
  Year 2011 Publication Tech. Phys. Lett. Abbreviated Journal Tech. Phys. Lett.  
  Volume 37 Issue 5 Pages 469-471  
  Keywords SSPD, SNSPD  
  Abstract The spectral dependence of the quantum efficiency of superconducting NbN single-photon detectors integrated with quarter-wave resonators based on Si3N4, SiO2, and SiO layers has been studied.  
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  Call Number RPLAB @ gujma @ Serial 664  
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Author Dauler, Eric; Kerman, Andrew; Robinson, Bryan; Yang, Joel; Voronov, Boris; Goltsman, Gregory; Hamilton, Scott; Berggren, Karl url  doi
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  Title Photon-number-resolution with sub-30-ps timing using multi-element superconducting nanowire single photon detectors Type Journal Article
  Year 2009 Publication J. Modern Opt. Abbreviated Journal J. Modern Opt.  
  Volume 56 Issue 2 Pages 364-373  
  Keywords PNR SSPD; SNSPD; photon-number-resolution; superconducting nanowire single photon detector; timing jitter; system detection efficiency  
  Abstract A photon-number-resolving detector based on a four-element superconducting nanowire single photon detector is demonstrated to have sub-30-ps resolution in measuring the arrival time of individual photons. This detector can be used to characterize the photon statistics of non-pulsed light sources and to mitigate dead-time effects in high-speed photon counting applications. Furthermore, a 25% system detection efficiency at 1550 nm was demonstrated, making the detector useful for both low-flux source characterization and high-speed photon-counting and quantum communication applications. The design, fabrication and testing of this detector are described, and a comparison between the measured and theoretical performance is presented.  
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  Call Number RPLAB @ gujma @ Serial 700  
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Author Третьяков, И.В.; Рябчун, С.А.; Каурова, Н.С.; Ларионов, П.А.; Лобастова, А.А.; Воронов, Б.М.; Финкель, М.И.; Гольцман, Г.Н. openurl 
  Title Оптимальная поглощенная мощность гетеродина для терагерцового сверхпроводникового NbN смесителя на электронном разогреве Type Journal Article
  Year 2010 Publication Письма в Журнал технической физики Abbreviated Journal Письма в ЖТФ  
  Volume 36 Issue 23 Pages 78-84  
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  Abstract Представлены результаты измерений поглощенной мощности гетеродина малошумящим широкополосным смесителем на эффекте электронного разогрева в резистивном состоянии сверхпроводниковой ультратонкой пленки NbN. Оптимальная поглощенная мощность гетеродина составила около 100 nW на частоте 2.5 THz.  
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  Call Number RPLAB @ gujma @ Serial 703  
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Author Ожегов, Р.В.; Горшков, К.Н.; Окунев, О.В.; Гольцман, Г.Н. openurl 
  Title Сверхпроводниковый смеситель на эффекте электронного разогрева как элемент матрицы системы построения тепловых изображений Type Journal Article
  Year 2010 Publication Письма в Журнал технической физики Abbreviated Journal Письма в ЖТФ  
  Volume 36 Issue 21 Pages 70-78  
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  Abstract Исследована возможность использования матрицы чувствительных элементов на гиперполусферической линзе диаметром 12 mm в тепловизоре терагерцевого диапазона частот. Получены размеры области на линзе, приемлемой для расположения матрицы, в которой шумовая температура приемника меняется в пределах 16% от средней. Диаметр этой области составил 3.3% диаметра линзы.Получены отклонения основного лепестка диаграммы направленности, которые составили ±1.25â—<a6> от направления с оптимальным положением смесителя. Флуктуационная чувствительность приемника в эксперименте составила 0.5 K на частоте 300 GHz.  
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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 704  
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