Low-noise readout of superconducting bolometers based on electrothermal feedback

Jari S. Penttilä (Corresponding Author), Hannu Sipola, Panu Helistö, Heikki Seppä

    Research output: Contribution to journalArticleScientificpeer-review

    33 Citations (Scopus)


    We have developed a simple room-temperature readout for superconducting bolometers and calorimeters. Due to electro-thermal feedback, the bolometer can be noise-matched with the readout amplifier. The constructed amplifier consists of low-noise field-effect transistors, and voltage bias is actively provided by electrical feedback. According to our measurements on superconducting vacuum-bridge bolometers, the total noise is limited by the bolometer phonon and Johnson noise characterized by a critical temperature of 8.5 K. We show that, with proper sensor design, it is possible to reach the photon noise limit in video-rate submillimetre imaging applications.
    Original languageEnglish
    Pages (from-to)319-322
    Number of pages4
    JournalSuperconductor Science and Technology
    Issue number4
    Publication statusPublished - 2006
    MoE publication typeA1 Journal article-refereed


    • superconducting bolometers
    • superconducting calorimeters
    • bolometers


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