Suspended tunnel junction bolometers for terahertz range

Andrey V. Timofeev (Corresponding Author), Panu Helistö, Leif Grönberg, Arttu Luukanen, Heikki Seppä, Juha Hassel

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    Implementation of high resolution passive THz cameras operated at cryogenic temperatures of a few Kelvin benefits from a large number of pixels. At present, building a cryogenic multiplexed read-out circuit represents a challenging task. Here we propose and demonstrate broadband niobium-based tunnel junction bolometers operating in equilibrium regime at 4 K, and read out with a room temperature amplifier with feedback. The implemented scheme allows independent impedance matching for the THz antenna and for the readout. Electrical feedback in the readout scheme eliminates the need for magnetic fields to suppress the supercurrent of the junction. We present electrical and preliminary optical measurements of the detectors. We also analyze a possible scheme for time-domain multiplexing.
    Original languageEnglish
    Pages (from-to)34-40
    Number of pages7
    JournalThe Open Applied Physics Journal
    Volume5
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    bolometers
    tunnel junctions
    impedance matching
    cryogenic temperature
    multiplexing
    optical measurement
    niobium
    cryogenics
    readout
    antennas
    amplifiers
    pixels
    cameras
    broadband
    high resolution
    detectors
    room temperature
    magnetic fields

    Keywords

    • THz imaging
    • bolometers
    • SIS junction

    Cite this

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    title = "Suspended tunnel junction bolometers for terahertz range",
    abstract = "Implementation of high resolution passive THz cameras operated at cryogenic temperatures of a few Kelvin benefits from a large number of pixels. At present, building a cryogenic multiplexed read-out circuit represents a challenging task. Here we propose and demonstrate broadband niobium-based tunnel junction bolometers operating in equilibrium regime at 4 K, and read out with a room temperature amplifier with feedback. The implemented scheme allows independent impedance matching for the THz antenna and for the readout. Electrical feedback in the readout scheme eliminates the need for magnetic fields to suppress the supercurrent of the junction. We present electrical and preliminary optical measurements of the detectors. We also analyze a possible scheme for time-domain multiplexing.",
    keywords = "THz imaging, bolometers, SIS junction",
    author = "Timofeev, {Andrey V.} and Panu Helist{\"o} and Leif Gr{\"o}nberg and Arttu Luukanen and Heikki Sepp{\"a} and Juha Hassel",
    note = "Project code: 72785",
    year = "2012",
    doi = "10.2174/1874183501205010034",
    language = "English",
    volume = "5",
    pages = "34--40",
    journal = "The Open Applied Physics Journal",
    issn = "1874-1835",
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    Suspended tunnel junction bolometers for terahertz range. / Timofeev, Andrey V. (Corresponding Author); Helistö, Panu; Grönberg, Leif; Luukanen, Arttu; Seppä, Heikki; Hassel, Juha.

    In: The Open Applied Physics Journal, Vol. 5, 2012, p. 34-40.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Suspended tunnel junction bolometers for terahertz range

    AU - Timofeev, Andrey V.

    AU - Helistö, Panu

    AU - Grönberg, Leif

    AU - Luukanen, Arttu

    AU - Seppä, Heikki

    AU - Hassel, Juha

    N1 - Project code: 72785

    PY - 2012

    Y1 - 2012

    N2 - Implementation of high resolution passive THz cameras operated at cryogenic temperatures of a few Kelvin benefits from a large number of pixels. At present, building a cryogenic multiplexed read-out circuit represents a challenging task. Here we propose and demonstrate broadband niobium-based tunnel junction bolometers operating in equilibrium regime at 4 K, and read out with a room temperature amplifier with feedback. The implemented scheme allows independent impedance matching for the THz antenna and for the readout. Electrical feedback in the readout scheme eliminates the need for magnetic fields to suppress the supercurrent of the junction. We present electrical and preliminary optical measurements of the detectors. We also analyze a possible scheme for time-domain multiplexing.

    AB - Implementation of high resolution passive THz cameras operated at cryogenic temperatures of a few Kelvin benefits from a large number of pixels. At present, building a cryogenic multiplexed read-out circuit represents a challenging task. Here we propose and demonstrate broadband niobium-based tunnel junction bolometers operating in equilibrium regime at 4 K, and read out with a room temperature amplifier with feedback. The implemented scheme allows independent impedance matching for the THz antenna and for the readout. Electrical feedback in the readout scheme eliminates the need for magnetic fields to suppress the supercurrent of the junction. We present electrical and preliminary optical measurements of the detectors. We also analyze a possible scheme for time-domain multiplexing.

    KW - THz imaging

    KW - bolometers

    KW - SIS junction

    U2 - 10.2174/1874183501205010034

    DO - 10.2174/1874183501205010034

    M3 - Article

    VL - 5

    SP - 34

    EP - 40

    JO - The Open Applied Physics Journal

    JF - The Open Applied Physics Journal

    SN - 1874-1835

    ER -