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Tretyakov, I. V.; Ryabchun, S. A.; Maslennikov, S. N.; Finkel, M. I.; Kaurova, N. S.; Seleznev, V. A.; Voronov, B. M.; Gol'tsman, G.N. |
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NbN HEB mixer: fabrication, noise temperature reduction and characterization |
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2008 |
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Proc. Basic problems of superconductivity |
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HEB, mixer, noise temperature, conversion gain bandwidth |
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We demonstrate that in the terahertz region superconducting hot-electron mixers offer the lowest noise temperature, opening the possibility of using HTS's in the future to fabricate these devices. Specifically, a noise temperature of 950 K was measured for the receiver operating at 2.5 THz with a NbN HEB mixer, and a gain bandwidth of 6 GHz was measured at 300 GHz near Tc for the same mixer. |
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Moscow-Zvenigorod |
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591 |
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Финкель, М. И. |
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Терагерцовые смесители на эффекте электронного разогрева в ультратонких плёнках NbN и NbTiN |
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2006 |
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М. МПГУ |
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HEB, detector, mixer, terahertz, THz, infrared, IR, direct detection effect, conversion bandwidth, conversion loss |
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Ph.D. thesis |
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597 |
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Рябчун, С. А. |
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Широкополосные высокостабильные терагерцовые смесители на горячих электронах из тонких сверхпроводниковых пленок NbN |
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2009 |
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М. МПГУ |
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98 |
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HEB, mixer, terahertz, THz, stability, Allan variance, conversion bandwidth, in-situ technique, Au contacts |
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Ph.D. thesis |
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598 |
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Nebosis, R. S.; Semenov, A. D.; Gousev, Yu. P.; Renk, K. F. |
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Rigorous analysis of a superconducting hot-electron bolometer mixer: theory and comparision with experiment |
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1996 |
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Proc. 7th Int. Symp. Space Terahertz Technol. |
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601-613 |
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HEB mixer, model, conversion gain, noise temperature, impedance, 2.5 THz |
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Charlottesville, Virginia, USA |
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605 |
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Risacher, C.; Meledin, D.; Belitsky, V.; Bergman, P. |
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First 1.3 THz observations at the APEX telescope |
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2009 |
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Proc. 20th Int. Symp. Space Terahertz Technol. |
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54-61 |
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balanced HEB mixer noise temperature APEX telescope stability Allan variance aperture efficiency |
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The Atacama Pathfinder EXperiment (APEX) 12m telescope is operating on the Llano Chajnantor, Chile, since 2003 and a set of state of the art sub-millimeter receivers have been installed for frequencies spanning from 150 GHz to 1500 GHz. In 2008, a balanced 1.3 THz Hot Electron Bolometer (HEB) receiver was installed for the atmospheric window 1250-1380 GHz. This instrument is part of a 4-channel receiver cryostat with the other channels being 211-275 GHz, 275-370 GHz and 380-500 GHz Sideband Separating (SSB) SIS receivers. This paper presents the first observations obtained so far with the 1.3 THz band during its first months of operation. The sky measurements were taken during opportunistic commissioning and science verification phases, when the weather conditions were sufficiently good with a Precipitable Water Vapor (PWV) below 0.25 mm, which was the case only a few nights during these months. We present the first observations of the molecular transition CO J=(11-10) line on different sources such as Orion-FIR4, CW-Leo and SgrB2(M). We describe the many challenges and difficulties encountered for achieving successful THz observations from a large sub-millimeter ground-based telescope. |
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