NbTiN/SiO2/Al tuning circuits for low-noise 1 THz SISmixers

摘要

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