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Author Skalare, A.; McGrath, William R.; Echternach, P. M.; Leduc, H. G.; Siddiqi, I.; Verevkin, A.; Prober, D. E.
Title Aluminum hot-electron bolometer mixers at submillimeter wavelengths Type Journal Article
Year 2001 Publication (down) IEEE Trans. Appl. Supercond. Abbreviated Journal
Volume 11 Issue 1 Pages 641-644
Keywords Al HEB mixer, contacts, interface, in situ, in-situ, Aluminium HEB mixer
Abstract Diffusion-cooled aluminum hot-electron bolometer (HEB) mixers are of interest for low-noise high resolution THz-frequency spectroscopy within astrophysics. Al HEB mixers offer operation with an order of magnitude less local oscillator power, higher intermediate frequency bandwidth and potentially lower noise than competing devices made from other materials. We report on mixer experiments at 618 GHz with devices fabricated from films with sheet resistances in the range from about 55 Ω down to about 9 Ω per square. Intermediate frequency bandwidths of up to 3 GHz were measured (1 μm long device), with absorbed local oscillator power levels of 0.5 to 6 nW and mixer conversion up to -21.5 dB. High input coupling efficiency implies that the electrons in the device are able to thermalize before escaping from the device. It was found that the long coherence length complicates mixer operations due to the proximity of the contact pads. Also, saturation at the IF frequency may be a concern for this type of device, and warrants further studies.
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ISSN 1051-8223 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number ref919426b Serial 1061
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Author Kawamura, J.; Tong, C.-Y. E.; Blundell, R.; Papa, D. C.; Hunter, T. R.; Patt, F.; Gol’tsman, G.; Gershenzon, E.
Title Terahertz-frequency waveguide NbN hot-electron bolometer mixer Type Journal Article
Year 2001 Publication (down) IEEE Trans. Appl. Supercond. Abbreviated Journal IEEE Trans. Appl. Supercond.
Volume 11 Issue 1 Pages 952-954
Keywords NbN HEB mixers
Abstract We have developed a low-noise waveguide heterodyne receiver for operation near 1 THz using phonon-cooled NbN hot-electron bolometers. The mixer elements are submicron-sized microbridges of 4 nm-thick NbN film fabricated on a quartz substrate. Operating at a bath temperature of 4.2 K, the double-sideband receiver noise temperature is 760 K at 1.02 THz and 1100 K at 1.26 THz. The local oscillator is provided by solid-state sources, and power measured at the source is less than 1 /spl mu/W. The intermediate frequency bandwidth exceeds 2 GHz. The receiver was used to make the first ground-based heterodyne detection of a celestial spectroscopic line above 1 THz.
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ISSN 1558-2515 ISBN Medium
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Notes Approved no
Call Number Serial 1546
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Author Danny Wilms Floet
Title Hotspot mixing in THz niobium superconducting hot electron bolometer mixers Type Manuscript
Year 2001 Publication (down) Delft University of Technology Abbreviated Journal
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Corporate Author Thesis Ph.D. thesis
Publisher Place of Publication Netherlands Editor
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Notes Approved no
Call Number Serial 932
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Author Xu, Y.; Zheng, X.; Williams, C.; Verevkin, A.; Sobolewski, R.; Chulkova, G.; Lipatov, A.; Okunev, O.; Smirnov, K.; Gol’tsman, G. N.
Title Ultrafast superconducting hot-electron single-photon detector Type Conference Article
Year 2001 Publication (down) CLEO Abbreviated Journal CLEO
Volume Issue Pages 345
Keywords NbN SSPD, SNSPD
Abstract Summary form only given. The current most-pressing need is to develop a practical, GHz-range counting single-photon detector, operational at either 1.3-/spl mu/m or 1.55-/spl mu/m radiation wavelength, for novel quantum communication and quantum cryptography systems. The presented solution of the problem is to use an ultrafast hot-electron photodetector, based on superconducting thin-film microstructures. This type of device is very promising, due to the macroscopic quantum nature of superconductors. Very fast response time and the small, (meV range) value of the superconducting energy gap characterize the superconductor, leading to the efficient avalanche process even for infrared photons.
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Area Expedition Conference Technical Digest. Summaries of papers presented at the Conference on Lasers and Electro-Optics. Postconference Technical Digest (IEEE Cat. No.01CH37170)
Notes Approved no
Call Number Serial 1545
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Author Chen, P. S.
Title Infrared properties of barium stars Type Journal Article
Year 2001 Publication (down) Astron. Astrophys. Abbreviated Journal A&A
Volume 372 Issue 1 Pages 245-248
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ISSN 0004-6361 ISBN Medium
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Notes Approved no
Call Number RPLAB @ s @ Serial 415
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Author Ganzevles, W. F. M.; Gao, J. R.; de Korte, P. A. J.; Klapwijk, T. M.
Title Direct response of microstrip line coupled Nb THz hot-electron bolometer mixers Type Journal Article
Year 2001 Publication (down) Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.
Volume 79 Issue 15 Pages 2483-2485
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ISSN 0003-6951 ISBN Medium
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Notes Approved no
Call Number Serial 311
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Author Zwiller, Vale<cc><81>ry; Blom, Hans; Jonsson, Per; Panev, Nikolay; Jeppesen, Sören; Tsegaye, Tedros; Goobar, Edgard; Pistol, Mats-Erik; Samuelson, Lars; Björk, Gunnar
Title Single quantum dots emit single photons at a time: Antibunching experiments Type Journal Article
Year 2001 Publication (down) Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.
Volume 78 Issue 17 Pages 2476
Keywords antibunching, quantum dot
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ISSN 0003-6951 ISBN Medium
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Notes Approved no
Call Number Serial 502
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Author Siemsen, K. J.; Bernard, J. E.; Madej, A. A.; Marmet, L.
Title Absolute frequency measurement of a CO2/OsO4 stabilized laser at 28.8 THz Type Journal Article
Year 2001 Publication (down) Applied Physics B: Lasers and Optics Abbreviated Journal Appl. Phys. B: Lasers and Optics
Volume 72 Issue Pages 567-573
Keywords HgCdTe detector
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Call Number Serial 462
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Author Shelkovnikov, A.; Grain, C.; Nguyen, C. T.; Butcher, R. J.; Amy-Klein, A.; Chardonnet, C.
Title 500-Hz two-photon Ramsey fringes with a SF6 beam: towards a new frequency standard in the 30-THz spectral region Type Journal Article
Year 2001 Publication (down) Applied Physics B: Lasers and Optics Abbreviated Journal Appl. Phys. B: Lasers and Optics
Volume 73 Issue Pages 93-98
Keywords THz applications
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Notes Approved no
Call Number Serial 485
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Author Gershenson, M. E.; Gong, D.; Sato, T.; Karasik, B. S.; Sergeev, A. V.
Title Millisecond electron-phonon relaxation in ultrathin disordered metal films at millikelvin temperatures Type Journal Article
Year 2001 Publication (down) Appl. Phys. Lett. Abbreviated Journal
Volume 79 Issue Pages 2049-2051
Keywords HEB detector, FIR, far infrared
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Notes Approved no
Call Number RPLAB @ s @ heb_eph_interaction_Gershenzon Serial 315
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