Title :
NbTiN/SiO2/Al tuning circuits for low-noise 1 THz SIS mixers
Author :
Jackson, B.D. ; Iosad, N.N. ; de Lange, G. ; Baryshev, A.M. ; Laauwen, W.M. ; Gao, J.R. ; Klapwijk, T.M.
Author_Institution :
Space Res. Organ. of the Netherlands, Groningen, Netherlands
fDate :
3/1/2001 12:00:00 AM
Abstract :
Waveguide SIS mixers in which Nb/Al-AlOx/Nb tunnel junctions are integrated with NbTiN/SiO/2/Al tuning circuits are shown to yield receiver noise temperatures as low as 565 K at 970 GHz. Analyzing the noise and gain of one such receiver, it is shown that the NbTiN ground plane is low-loss (<0.6 dB) at 970 GHz. These results are in good agreement with results obtained previously with a quasi-optical mixer incorporating a similar tuning circuit. A decrease in sensitivity above 1 THz is attributed to increasing loss in the NbTiN
Keywords :
aluminium; circuit tuning; niobium compounds; silicon compounds; submillimetre wave mixers; submillimetre wave receivers; superconducting device noise; superconductor-insulator-superconductor mixers; titanium compounds; waveguide components; 0.6 dB; 1 THz; Nb-Al-AlO-Nb; Nb/Al-AlOx/Nb tunnel junction; NbTiN-SiO2-Al; NbTiN/SiO2/Al tuning circuit; gain; ground plane; loss; noise temperature; terahertz receiver; waveguide SIS mixer; Artificial intelligence; Circuit noise; Circuit optimization; Josephson junctions; Niobium; Superconducting device noise; Superconducting devices; Superconducting epitaxial layers; Waveguide junctions; Wiring;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
