Title :
A MM-wave radiometer with planar Nb/a-Si/Nb Josephson junction
Author :
Kulikov, V.A. ; Matveets, L.V. ; Gudkov, A.L. ; Laptev, V.N. ; Makhov, V.I.
Author_Institution :
Inst. of Terrestrial Magnetism, Ionosphere & Radio Wave Propagation, Acad. of Sci., Troitsk, USSR
fDate :
3/1/1991 12:00:00 AM
Abstract :
A report is presented on an investigation of the electrical and detection properties of thin-film step-edge submicron Nb/a-Si/Nb Josephson junctions for use as a detector in radioastronomical radiometers. These junctions are stable, thermally recyclable junctions with nonhysteretic I-V characteristics, Rn=(20-200) Ω and jc~10 5 A/cm. A wideband modulation radiometer for the 4-mm-wavelength range with a Nb/a-Si/Nb Josephson junction has been developed. The best fluctuation sensitivity has been achieved at 0.007 K for a 1-s. integration time
Keywords :
Josephson effect; amorphous semiconductors; elemental semiconductors; microwave detectors; niobium; radioastronomical techniques; radiometers; radiotelescopes; silicon; solid-state microwave devices; superconducting junction devices; 0.007 K; 4 mm; Josephson junction; MM-wave radiometer; Nb-Si-Nb; detection properties; electrical properties; fluctuation sensitivity; nonhysteretic I-V characteristics; planar submicron junctions; radioastronomical radiometers; superconductor-amorphous semiconductor interface; thermally recyclable junctions; thin-film step-edge; wideband modulation; Capacitance; Detectors; Electrodes; Fabrication; Josephson junctions; Niobium; Radiometry; Substrates; Voltage; Wideband;
Journal_Title :
Magnetics, IEEE Transactions on
