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Author Maslennikov, S.; Antipov, S.; Shishkov, A.; Svechnikov, S.; Voronov, B.; Smirnov, K.; Kaurova, N.; Drakinski, V.; Gol'tsman, G.
Title NbN HEB mixer noise temperature measurements with hot/cold load mounted inside the helium cryostat at 300 GHz Type Conference Article
Year 2002 Publication Proc. Int. Student Seminar on Microwave Appl. of Novel Physical Phenomena supported by IEEE Abbreviated Journal (up)
Volume Issue Pages
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Publisher LETI Place of Publication St.-Petersburg Editor
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Notes Approved no
Call Number Serial 324
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Author Blundell, R.; Barrett, J.; H. Gibson, C. Gotteib; Hunter, T.; Kimberk, R.; Leiker, S.; Marrone, D.; Meledin, D.; Paine, S.; Papa, D. C.; Plante, R.; Riddle, P.; Smith, M.; Sridharan, T.; Tong, C. E.; Wilson, R.; Diaz, M.; Bronfman, L.; May, J.; Otarola, A.; Radford, S. J.
Title Prospects for terahertz radio astronomy from Northean Chile Type Conference Article
Year 2002 Publication Proc. 13th Int. Symp. Space Terahertz Technol. Abbreviated Journal (up)
Volume Issue Pages 159-166
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Publisher Place of Publication Cambridge, MA, USA Editor Harvard university
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Notes Approved no
Call Number RPLAB @ s @ meledin_2p5_stability Serial 327
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Author Baryshev, A.; Lauria, E.; Hesper, R.; Zijlstra, T.; Wild, W.
Title Fixed-tuned waveguide 0.6 THz SIS mixer with wide band IF Type Conference Article
Year 2002 Publication Proc. 13th Int. Symp. Space Terahertz Technol. Abbreviated Journal (up)
Volume Issue Pages 1-9
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Publisher Place of Publication Cambridge, MA, USA Editor Harward University
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Notes Approved no
Call Number RPLAB @ s @ nt_SIS_136at0p65THz Serial 328
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Author Verevkin, A.; Zhang, J.; Sobolewski, Roman; Lipatov, A.; Okunev, O.; Chulkova, G.; Korneev, A.; Smirnov, K.; Gol'tsman, G. N.; Semenov, A.
Title Detection efficiency of large-active-area NbN single-photon superconducting detectors in the ultraviolet to near-infrared range Type Journal Article
Year 2002 Publication Appl. Phys. Lett. Abbreviated Journal (up)
Volume 80 Issue 25 Pages 4687-4689
Keywords NbN SSPD, SNSPD, QE
Abstract We report our studies on spectral sensitivity of meander-type, superconducting NbN thin-film single-photon detectors (SPDs), characterized by GHz counting rates of visible and near-infrared photons and negligible dark counts. Our SPDs exhibit experimentally determined quantum efficiencies ranging from ∼0.2% at the 1.55 μm wavelength to ∼70% at 0.4 μm. Spectral dependences of the detection efficiency (DE) at the 0.4 to 3.0-μm-wavelength range are presented. The exponential character of the DE dependence on wavelength, as well as its dependence versus bias current, is qualitatively explained in terms of superconducting fluctuations in our ultrathin, submicron-width superconducting stripes. The DE values of large-active-area NbN SPDs in the visible range are high enough for modern quantum communications.
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Call Number Serial 331
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Author Ediss, G. A.; Koller, D.
Title 68.5 to 118 GHz measurements of possible infrared filter materials: black polyethylene, Zitex, and grooved and un-grooved fluorogold and HDPE Type Miscellaneous
Year 2002 Publication ALMA Memo Abbreviated Journal (up)
Volume Issue 412 Pages
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Notes Approved no
Call Number RPLAB @ s @ Serial 446
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Author Zhou, Y.D.; Becker, C. R.; Ashokan, R.; Selamet, Y.; Chang, Y.; Boreiko, R. T.; Betz, A. L.; Sivananthan, S.
Title Progress in far-infrared detection technology Type Conference Article
Year 2002 Publication Proc. SPIE Abbreviated Journal (up)
Volume 4795 Issue Pages 121-128
Keywords HgCdTe/CdTe, detector
Abstract II-VI intrinsic very long wavelength infrared (VLWIR, λc~20 to 50 μm) materials, HgCdTe alloys as well as HgCdTe/CdTe superlattices, were grown by molecular beam epitaxy (MBE). The layers were characterized by means of X-ray diffraction, conventional Fourier transform infrared spectroscopy, Hall effect measurements and transmittance electron microscopy (TEM). Photoconductor devices were processed and their spectral response was also measured to demonstrate their applicability in the VLWIR region.
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Series Editor Longshore, R. E.; Sivananthan, S. Series Title Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series Abbreviated Series Title
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Notes Approved no
Call Number Serial 471
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Author Colombelli, R
Title FIR quantum cascade lasers at λ>20 μm and THz emitters at λ=80 μm Type Journal Article
Year 2002 Publication Phys. E: Low-dimensional Systems and Nanostructures Abbreviated Journal (up)
Volume 13 Issue 2-4 Pages 848-853
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ISSN 1386-9477 ISBN Medium
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Notes Approved no
Call Number Serial 483
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Author Benford, Dominic J.; Moseley, S. Harvey; Chervenak, Jay A.
Title Mission requirements for ultralow-background, large format bolometer arrays Type Conference Article
Year 2002 Publication Proc. Far-Infrared Submillimeter, & Millimeter Detector Workshop Abbreviated Journal (up)
Volume Issue Pages
Keywords applicationsns
Abstract
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Corporate Author Thesis
Publisher Place of Publication Monterey, California Editor
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Notes Approved no
Call Number Serial 490
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Author Peter H. Siegel
Title Terahertz technology Type Journal Article
Year 2002 Publication IEEE Trans. Microw. Theory Techn. Abbreviated Journal (up)
Volume 50 Issue 3 Pages 910-928
Keywords THz applications
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Notes Approved no
Call Number Serial 494
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Author Betzler, Klaus; Physik, Fachbereich
Title Fabry-Perot Interferometer Type Manuscript
Year 2002 Publication Universität Osnabrück Abbreviated Journal (up)
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Notes Approved no
Call Number Serial 497
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Author Amzajerdian, Farzin
Title Analysis of optimum heterodyne receivers for coherent lidar applications Type Miscellaneous
Year 2002 Publication Abbreviated Journal (up)
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Notes Approved no
Call Number Serial 505
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Author Ito, Hiroshi
Title High frequency photodiode work in Japan Type Manuscript
Year 2002 Publication Report at NTT photonics laboratories Abbreviated Journal (up)
Volume Issue Pages 1-4
Keywords THz, terahertz communications, photodiode
Abstract The recent progress in the device performance of the uni-traveling-carrier photodiode (UTC-PD) is described. The UTC-PD utilizes only electrons as the active carriers, and this unique feature is the key to achieving excellent high-speed and high-output characteristics simultaneously. The achieved performance includes a record 3-dB bandwidth of 310 GHz, high-power photonic millimeter-wave generation with an output power of over +13 dBm at 100 GHz, high-output-voltage photoreceiver operation at bit rates of up to 80 Gbit/s, and demultiplexing operation at 200 Gbit/s using a monolithic PD-EAM optical gate.
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Call Number Serial 596
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Author Deang, Jennifer; Du, Qiang; Gunzburger, Max D.
Title Modeling and computation of random thermal fluctuations and material defects in the Ginzburg–Landau model for superconductivity Type Journal Article
Year 2002 Publication J. Comp. Phys. Abbreviated Journal (up)
Volume 181 Issue 1 Pages 45-67
Keywords noise; superconductivity; finite element methods; fluctuations.
Abstract It is well known that thermal fluctuations and material impurities affect the motion of vortices in superconductors. These effects are modeled by variants of a time-dependent Ginzburg-Landau model containing either additive or multiplicative noise. Numerical computations are presented that illustrate the effects that noise has on the dynamics of vortex nucleation and vortex motion. For an additive noise model with relatively low variances, it is found that the vortices form a quasi-steady-state lattice in which the vortex core sizes remain roughly fixed but their positions vibrate. Two multiplicative noise models are considered. For one model having relatively long-range order, the sizes of the vortex cores vary in time and from one vortex to another. Finally, for the additive noise case, we show that as the variance of the noise tends to zero, solutions of the stochastic time-dependent Ginzburg-Landau equations converge to solutions of the corresponding equations with no noise.
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Call Number RPLAB @ gujma @ Serial 758
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Author Omar, A.; Anantharamaiah, K. R.; Rupen, M.; Rigby, J.
Title VLA detection of OH absorption from the elliptical galaxy NGC 1052 Type Journal Article
Year 2002 Publication Astron. Astrophys. Abbreviated Journal (up) A&A
Volume 381 Issue 1 Pages L29-L32
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ISSN 0004-6361 ISBN Medium
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Notes Approved no
Call Number RPLAB @ s @ Serial 435
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Author Kawamura, J.; Hunter, T. R.; Tong, C. Y. E.; Blundell, R.; Papa, D. C.; Patt, F.; Peters, W.; Wilson, T.; Henkel, C.; Goltsman, G.; Gershenzon, E.
Title Ground-based terahertz CO spectroscopy towards Orion Type Journal Article
Year 2002 Publication A&A Abbreviated Journal (up) A&A
Volume 394 Issue 1 Pages 271-274
Keywords HEB mixers, applications
Abstract Using a superconductive hot-electron bolometer heterodyne receiver on the 10-m Heinrich Hertz Telescope on Mount Graham, Arizona, we have obtained velocity-resolved 1.037 THz CO () spectra toward several positions along the Orion Molecular Cloud (OMC-1) ridge. We confirm the general results of prior observations of high-J CO lines that show that the high temperature, , high density molecular gas, , is quite extended, found along a ~ region centered on BN/KL. However, our observations have significantly improved angular resolution, and with a beam size of we are able to spatially and kinematically discriminate the emission originating in the extended quiescent ridge from the very strong and broadened emission originating in the compact molecular outflow. The ridge emission very close to the BN/KL region appears to originate from two distinct clouds along the line of sight with and ≈ . The former component dominates the emission to the south of BN/KL and the latter to the north, with a turnover point coincident with or near BN/KL. Our evidence precludes a simple rotation of the inner ridge and lends support to a model in which there are multiple molecular clouds along the line of sight towards the Orion ridge.
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Call Number Serial 322
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