Search Results - (Author, Cooperation:J. Zmuidzinas)

Showing 1 - 8 results of 8, query time: 0.12s Refine Results
  1. 1
    D. A. Riechers ; C. M. Bradford ; D. L. Clements ; C. D. Dowell ; I. Perez-Fournon ; R. J. Ivison ; C. Bridge ; A. Conley ; H. Fu ; J. D. Vieira ; J. Wardlow ; J. Calanog ; A. Cooray ; P. Hurley ; R. Neri ; J. Kamenetzky ; J. E. Aguirre ; B. Altieri ; V. Arumugam ; D. J. Benford ; M. Bethermin ; J. Bock ; D. Burgarella ; A. Cabrera-Lavers ; S. C. Chapman ; P. Cox ; J. S. Dunlop ; L. Earle ; D. Farrah ; P. Ferrero ; A. Franceschini ; R. Gavazzi ; J. Glenn ; E. A. Solares ; M. A. Gurwell ; M. Halpern ; E. Hatziminaoglou ; A. Hyde ; E. Ibar ; A. Kovacs ; M. Krips ; R. E. Lupu ; P. R. Maloney ; P. Martinez-Navajas ; H. Matsuhara ; E. J. Murphy ; B. J. Naylor ; H. T. Nguyen ; S. J. Oliver ; A. Omont ; M. J. Page ; G. Petitpas ; N. Rangwala ; I. G. Roseboom ; D. Scott ; A. J. Smith ; J. G. Staguhn ; A. Streblyanska ; A. P. Thomson ; I. Valtchanov ; M. Viero ; L. Wang ; M. Zemcov ; J. Zmuidzinas
    Nature Publishing Group (NPG)
    Published 2013
    Staff View
    Publication Date:
    2013-04-20
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Engargiola, G. ; Zmuidzinas, J. ; Lo, K. Y.

    [S.l.] : American Institute of Physics (AIP)
    Published 1994
    Staff View
    ISSN:
    1089-7623
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Electrical Engineering, Measurement and Control Technology
    Notes:
    A 492 GHz quasioptical superconductor-insulator-superconductor (SIS) heterodyne receiver for submillimeter astronomy has been constructed with a double-sideband noise temperature of 170±25 K, where the system response is an average over a 600 MHz i.f. bandwidth centered at 1.5 GHz. The excellent sensitivity is achieved through use of a planar twin-slot antenna feeding a pair of Nb–Al2O3–Nb junctions linked by an inductance. A main beam of f/15 has been measured. The performance of this receiver is comparable to that of the best 492 GHz waveguide receivers currently in operation.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1144831

    Articles: DFG German National Licenses
  3. 3
    Bin, M. ; Gaidis, M. C. ; Zmuidzinas, J. ; Phillips, T. G. ; LeDuc, H. G.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1996
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    We describe a 1 THz quasioptical SIS mixer which uses a twin-slot antenna, an antireflection-coated silicon hyperhemispherical lens, Nb/Al-oxide/Nb tunnel junctions, and an aluminum normal-metal tuning circuit in a two-junction configuration. Since the mixer operates substantially above the gap frequency of niobium (ν(approximately-greater-than)2Δ/h∼700 GHz), a normal metal is used in the tuning circuit in place of niobium to reduce the Ohmic loss. The frequency response of the device was measured using a Fourier transform spectrometer and agrees reasonably well with the theoretical prediction. At 1042 GHz, the uncorrected double-sideband receiver noise temperature is 840 K when the physical temperature of the mixer is 2.5 K. This is the first SIS mixer which outperforms GaAs Schottky diode mixers by a large margin at 1 THz. © 1996 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.115915

    Articles: DFG German National Licenses
  4. 4
    Zmuidzinas, J. ; Betz, A.L. ; Boreiko, R.T.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0020-0891
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0020-0891(89)90013-4

    Articles: DFG German National Licenses
  5. 5
    Staff View
    ISSN:
    1432-0649
    Keywords:
    42.50
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00697835

    Articles: DFG German National Licenses
  6. 6
    Staff View
    ISSN:
    1572-9559
    Keywords:
    NbTiN superconducting films ; SIS junctions ; Niobium bandgap
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract Recent results at 1 THz using normal-metal tuning circuits have shown that SIS mixers can work well up to twice the gap frequency of the junction material (niobium). However, the performance at 1 THz is limited by the substantial loss in the normal metal films. For better performance superconducting films with a higher gap frequency than niobium and with low RF loss are needed. Niobium nitride has long been considered a good candidate material, but typical NbN films suffer from high RF loss. To circumvent this problem we are currently investigating the RF loss in NbTiN films, a 15K Tc compound superconductor, by incorporating them into quasi-optical slot antenna SIS devices.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1023/A:1022595223782

    Articles: DFG German National Licenses
  7. 7
    Staff View
    ISSN:
    1572-9559
    Keywords:
    Fourier Transform ; spectroscopy ; quasi-optics ; heterodyne ; SIS ; dielectrics ; submillimeterwaves ; material properties
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract We have designed and constructed a Fourier Transform Spectrometer (FTS) for the study of submillimeter-wave mixers and optical components. The FTS has a large aperture (up to 25.4 cm) and small focal ratio (as fast as f/2.5) to achieve a large throughput. It operates in the 100-3750 GHz (3.3-125 cm−1) frequency range with a resolution of up to 75 MHz (0.0025 cm−1). Here we discuss the design goals and provide a detailed description of the construction of the FTS. In addition, we highlight the variety of studies which have been conducted with this instrument, which include characterizing SIS mixers through both direct and heterodyne detection and measuring the properties of optical materials.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1023/A:1021709330349

    Articles: DFG German National Licenses
  8. 8
    Staff View
    ISSN:
    1572-9559
    Keywords:
    SIS receiver ; twin-slot planar antenna ; NbTiN superconductor ; bandgap energy ; AlN tunnel barrier ; RF loss ; cooled optics
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract We have developed a niobium titanium nitride (NbTiN) based superconductor-insulator-superconductor (SIS) receiver to cover the 350 micron atmospheric window. This frequency band lies entirely above the energy gap of niobium (700 GHz), a commonly used SIS superconductor. The instrument uses an open structure twin-slot SIS mixer that consists of two Nb/AlN/NbTiN tunnel junctions, NbTiN thin-film microstrip tuning elements, and a NbTiN ground plane. The optical configuration is very similar to the 850 GHz waveguide receiver that was installed at the Caltech Submillimeter Observatory (CSO) in 1997. To minimize front-end loss, we employed reflecting optics and a cooled beamsplitter at 4 K. The instrument has an uncorrected receiver noise temperature of 205K DSB at 800 GHz and 410K DSB at 900 GHz. The degradation in receiver sensitivity with frequency is primarily due to an increase in the mixer conversion loss, which is attributed to the mismatch between the SIS junction and the twin-slot antenna impedance. The overall system performance has been confirmed through its use at the telescope to detect a wealth of new spectroscopic lines.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1023/A:1026444721454

    Articles: DFG German National Licenses