Ultrasensitive microwave nanobolometer

ORAL

Abstract

We have fabricated microwave nanobolometers using normal-metal nanowires. A part of the wire acts as an absorber of the microwave radiation whereas the remaining parts act as a sensitive thermometer with proximity-induced superconductivity. We use electrothermal feedback enhance the coupling of the temperature to the electrical degrees of freedom in the bolometer allowing us to measure a change in the radio-frequency signal caused by the absorption of microwave radiation. At the regime of large positive feedback, two metastable electron temperature states arise enabling threshold detection of microwave pulses down to 200 8.4-GHz photons, i.e., 1 zeptojule of energy. The measured noise-equivalent power of our nanobolometer is 2*10-20 W/Hz1/2 at 1-ms timeconstant. Finally, I present results on the devices where the normal-metal is replaced by graphene for enhanced performance.

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Presenters

  • Dibyendu Hazra

    QCD Labs, Department of Applied Physics, Aalto University

Authors

  • Dibyendu Hazra

    QCD Labs, Department of Applied Physics, Aalto University

  • Joonas Govenius

    QCD Labs, Department of Applied Physics, Aalto University

  • Russell Lake

    National Institute of Standards and Technology, NIST - Boulder, NIST, QCD Labs, Department of Applied Physics, Aalto University

  • Roope Kokkoniemi

    Department of applied physics, Aalto University, QCD Labs, Department of Applied Physics, Aalto University

  • Visa Vesterinen

    VTT Technical Research Centre of Finland Ltd

  • Marton Gunyho

    QCD Labs, Aalto University, QCD Labs, Department of Applied Physics, Aalto University

  • Kuan Tan

    QCD Labs, Department of Applied Physics, Aalto University, Department of applied physics, Aalto University

  • Jan Goetz

    Walther-Meißner-Institut & TU München, QCD Labs, Aalto University, QCD Labs, Department of Applied Physics, Aalto University

  • Matti Partanen

    QCD Labs, Department of Applied Physics, Aalto University, QCD Labs, Aalto University

  • Slavomir Simbierowicz

    VTT Technical Research Centre of Finland Ltd

  • Leif Grönberg

    VTT Technical Research Centre of Finland Ltd

  • antti Laitinen

    Low Temperature Laboratory, Department of Applied Physics, Aalto University

  • Pertti Hakonen

    Low Temperature Laboratory, Department of Applied Physics, Aalto University

  • Juha Hassel

    VTT Technical Research Centre of Finland Ltd

  • olli Pentti Saira

    Low Temperature Laboratory, Department of Applied Physics, Aalto University

  • Jukka Pekola

    School of Science, Aalto University, Aalto University, Low Temperature Laboratory, Department of Applied Physics, Aalto University

  • Janne Lehtinen

    VTT Technical Research Centre of Finland Ltd

  • Mika Prunnila

    VTT Technical Research Centre of Finland Ltd

  • Mikko Möttönen

    QCD Labs, Department of Applied Physics, Aalto University, QCD Labs, Aalto University, Department of applied physics, Aalto University