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Author Kern, Pierre; Le Coärer, Etienne; Benech, Pierre openurl 
  Title On-chip spectro-detection for fully integrated coherent beam combiners Type Journal Article
  Year 2009 Publication Optics Express Abbreviated Journal Opt.Express  
  Volume 17 Issue 3 Pages 1976-1987  
  Keywords (up)  
  Abstract This paper presents how photonics associated with new arising detection technologies is able to provide fully integrated instrument for coherent beam combination applied to astrophysical interferometry. The feasibility and operation of on-chip coherent beam combiners has been already demonstrated using various interferometric combination schemes. More recently we proposed a new detection principle aimed at directly sampling and extracting the spectral information of an input signal together with its flux level measurement. The so-called SWIFTS demonstrated concept that stands for Stationary-Wave Integrated Fourier Transform Spectrometer, provides full spectral and spatial information recorded simultaneously thanks to a motionless detecting device. Due to some newly available detection principles considered for the implementation of the SWIFTS concept, some technologies can even provide photo-counting operation that brought a significant extension of the interferometry domain of investigation in astrophysics. The proposed concept is applicable to most of the interferometric instrumental modes including fringe tracking, fast and sensitive detection, Fourier spectral reconstruction and also to manage a large number of incoming beams. The paper presents three practical implementations, two dealing with pair-wise integrated optics beam combinations and the third one with an all-in-one 8 beam combination. In all cases the principles turned into a pair wise baseline coding after proper data processing.  
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  Call Number RPLAB @ gujma @ Serial 650  
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Author Karpowicz, Nicholas; Lu, Xiaofei; Zhang, X.-C. openurl 
  Title Terahertz gas photonics Type Journal Article
  Year 2009 Publication J. Modern Opt. Abbreviated Journal  
  Volume 56 Issue 10 Pages 1137-1150  
  Keywords (up)  
  Abstract The underlying physics of the generation and detection of terahertz (THz) waves in gases are described. The THz wave generation process takes place in two steps: asymmetric gas ionization by two-frequency laser fields, followed by interaction of the ionized electron wave packets with the surrounding medium, producing an intense ‘echo' with tunable spectral content. In order to clarify the physical picture at the moment of ionization, the laser–atom interaction is treated through solution of the time-dependent Schrödinger equation, yielding an ab initio understanding of the release of the electron wave packets. The second step, where the electrons interact with the surrounding plasma is treated analytically. The resulting pressure dependence of the THz radiation is explored in detail. The THz wave detection process is shown to be the result of four-wave mixing, leading to analytical expressions of the signal obtained which allow for improved optimization of systems that exploit these effects.  
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  Call Number RPLAB @ gujma @ Serial 670  
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Author Polyakov, Sergey V.; Migdalla, Alan L. openurl 
  Title Quantum radiometry Type Journal Article
  Year 2009 Publication J. Modern Opt. Abbreviated Journal  
  Volume 56 Issue 9 Pages 1045-1052  
  Keywords (up)  
  Abstract We review radiometric techniques that take advantage of photon counting and stem from the quantum laws of nature. We present a brief history of metrological experiments and review the current state of experimental quantum radiometry.  
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  Call Number RPLAB @ gujma @ Serial 671  
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Author Yates, S. J. C.; Baryshev, A. M.; Baselmans, J. J. A.; Klein, B.; Güsten, R. openurl 
  Title Fast Fourier transform spectrometer readout for large arrays of microwave kinetic inductance detectors Type Journal Article
  Year 2009 Publication Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.  
  Volume 95 Issue 4 Pages 3  
  Keywords (up)  
  Abstract Microwave kinetic inductance detectors have great potential for large, very sensitive detector arrays for use in, for example, submillimeter imaging. Being intrinsically readout in the frequency domain, they are particularly suited for frequency domain multiplexing allowing ~1000 s of devices to be readout with one pair of coaxial cables. However, this moves the complexity of the detector from the cryogenics to the warm electronics. We present here the concept and experimental demonstration of the use of fast Fourier transform spectrometer readout, showing no deterioration of the noise performance compared to the low noise analog mixing while allowing high multiplexing ratios.  
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  Call Number RPLAB @ gujma @ Serial 697  
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Author Minaeva, Olga; Bonato, Cristian; Saleh, Bahaa E. A.; Simon, David S.; Sergienko, Alexander V. openurl 
  Title Odd- and even-order dispersion cancellation in quantum interferometry Type Journal Article
  Year 2009 Publication Phys. Rev. Lett. Abbreviated Journal Phys. Rev. Lett.  
  Volume 102 Issue 10 Pages 4  
  Keywords (up)  
  Abstract We describe a novel effect involving odd-order dispersion cancellation. We demonstrate that odd- and even-order dispersion cancellation may be obtained in different regions of a single quantum interferogram using frequency-anticorrelated entangled photons and a new type of quantum interferometer. This offers new opportunities for quantum communication and metrology in dispersive media.  
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  Call Number RPLAB @ gujma @ Serial 699  
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Author Ожегов, Р. В.; Окунев, О. В.; Гольцман, Г. Н.; Филиппенко, Л. В.; Кошелец, В. П. openurl 
  Title Флуктуационная чувствительность сверхпроводящего интегрального приемника терагерцового диапазона частот Type Journal Article
  Year 2009 Publication Радиотехника и электроника Abbreviated Journal Радиотех. электроник.  
  Volume 54 Issue 6 Pages 750-755  
  Keywords (up)  
  Abstract Исследована зависимость флуктуационной чувствительности сверхпроводящего интегрального приемника (СИП) от шумовой температуры приемника и величины входного сигнала. Измерена рекордная флуктуационная чувствительность приемника (13 ± 2 мК), полученная при шумовой температуре приемника 200 К, ширине полосы промежуточных частот 4 ГГц и постоянной времени 1 с. При уменьшении входного сигнала наблюдалось улучшение флуктуационной чувствительности; предложено обÑŠяснение полученного эффекта: причиной является уменьшение влияния нестабильностей источников питания приемника и усилительного тракта при снижении входного сигнала.  
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  Call Number RPLAB @ gujma @ Serial 710  
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Author Смирнов, Андрей Владимирович openurl 
  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 Gol'tsman, B. M.; Kutasov, V. A.; Luk'yanova, L. N. openurl 
  Title Mechanism of formation of texture and its influence on the strength of thermoelectric p-Bi0.5Sb1.5Te3 Type Journal Article
  Year 2009 Publication Physics of the Solid State Abbreviated Journal Phys. Sol. St.  
  Volume 51 Issue 4 Pages 747-749  
  Keywords (up)  
  Abstract It is established that, in preparing p-Bi0.5Sb1.5Te3 by vertical zone melting, in addition to the directional texture (characteristic of materials exhibiting a highly anisotropic growth rate) in which the cleavage planes of crystal grains are parallel to the direction of propagation of the crystallization front, other texture types can arise, in which the orientation of grain cleavage planes is ordered in a cross-sectional plane of the ingot. Two types of such textures, “radial” and “circular,” were observed. In a radial texture, the lines of intersection of grain cleavage planes with a cross-sectional plane of the ingot are oriented along radii of this cross section and, in a circular texture, these lines of intersection are oriented approximately perpendicular to a radius crossing the grain. The formation of a radial texture is associated with rotation of the ampoule with the crystallizing substance about its vertical axis causing centrifugal flows of the melt. The formation of a circular texture is associated with the orientation effect of the ampoule walls and with circular motion of the melt during torsional oscillations of the ampoule about the vertical axis. Ingots with a radial texture exhibit much lower resistance to splitting along their axis than ingots with a circular texture do. An explanation is provided for this fact.  
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  Call Number RPLAB @ gujma @ Serial 726  
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Author Khosropanah P.; Baryshev A.; Zhang W.; Jellema W.; Hovenier J.N.; Gao G.R.; Klapwijk T.M; Paveliev D.G.; Williams B.S.; Kumar S.; Hu Q.; Reno J.L.; Klein B.; Hesler J.L. openurl 
  Title Phase-locking of a 2.7-THz quantum cascade laser to a microwave reference Type Journal Article
  Year 2009 Publication Optics Letters Abbreviated Journal  
  Volume 34 Issue Pages 2958-2960  
  Keywords (up)  
  Abstract We demonstrate the phase locking of a 2.7 THz metal–metal waveguide quantum cascade laser (QCL) to an external microwave signal. The reference is the 15th harmonic, generated by a semiconductor superlattice nonlinear device, of a signal at 182 GHz, which itself is generated by a multiplier chain (X12) from a

microwave synthesizer at ~ 15 GHz. Both laser and reference radiations are coupled into a bolometer mixer, resulting in a beat signal, which is fed into a phase-lock loop. The spectral analysis of the beat signal con-firms that the QCL is phase locked. This result opens the possibility to extend heterodyne interferometers into the far-infrared range.		  
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  Call Number RPLAB @ atomics90 @ Serial 966  
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Author Cao, Q.; Yoon, S. F.; Tong, C. Z.; Ngo, C. Y.; Liu, C. Y.; Wang, R.; Zhao, H. X. openurl 
  Title Two-state competition in 1.3 μm multilayer InAs/InGaAs quantum dot lasers Type Journal Article
  Year 2009 Publication Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.  
  Volume 95 Issue 19 Pages 3  
  Keywords (up) 2DEG  
  Abstract The competition of ground state (GS) and excited state (ES) is investigated from the as-grown and thermally annealed 1.3 μm ten-layer p-doped InAs/GaAs quantum dot (QD) lasers. The modal gain competition between GS and ES are measured and analyzed around the ES threshold characteristics. Our results show that two-state competition is more significant in devices with short cavity length operating at high temperature. By comparing the as-grown and annealed devices, we demonstrate enhanced GS and suppressed ES lasing from the QD laser annealed at 600 °C for 15 s.  
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  Call Number RPLAB @ gujma @ Serial 673  
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