NbTiN/SiO(2)/Al tuning circuits for low-noise 1 THz SIS mixers

NbTiN/SiO(2)/Al tuning circuits for low-noise 1 THz SIS mixers

Waveguide SIS mixers in which Nb/Al-AlO(x)/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 ( <...

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Veröffentlicht in:IEEE transactions on applied superconductivity 2001-03, Vol.11 (1), p.653-656
Hauptverfasser: Jackson, B D, Iosad, N N, de Lange, G, Baryshev, A M, Laauwen, W M, Gao, J-R, Klapwijk, T M
Format: Artikel
Sprache:eng
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Zusammenfassung:Waveguide SIS mixers in which Nb/Al-AlO(x)/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
ISSN:1051-8223
DOI:10.1109/77.919429