Ultrasensitive proximity Josephson sensor with kinetic inductance readout
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Applied Physics Letters, Volume 92, Issue 16
AbstractWe propose a mesoscopic kinetic-inductance radiation detector based on a long superconductor-normal metal-superconductor Josephson junction. The operation of this proximity Josephson sensor relies on large kinetic inductance variations under irradiation due to the exponential temperature dependence of the critical current. Coupled with a dc superconducting quantum interference device readout, the PJS is able to provide a signal to noise (S/N) ratio up to ∼103 in the terahertz regime if operated as calorimeter, while electrical noise equivalent power as low as ∼7×10−20W/√Hz at 200mK can be achieved in the bolometer operation. The high performance together with the ease of fabrication make this structure attractive as an ultrasensitive cryogenic detector of terahertz electromagnetic radiation.
superconducting quantum interference devices, inductance, Josephson junctions, superconducting detectors, photons
Giazotto, Francesco & Heikkilä, Tero T. & Pepe, Giovanni Piero & Helistö, Panu & Luukanen, Arttu & Pekola, Jukka. 2008. Ultrasensitive proximity Josephson sensor with kinetic inductance readout. Applied Physics Letters. Volume 92, Issue 16. P. 162507/1-3. ISSN 0003-6951 (printed). DOI: 10.1063/1.2908922.