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Published March 1998 | public
Journal Article

Low-loss NbTiN films for THz SIS mixer tuning circuts

Abstract

Recent results at 1 THz using normal-metal tuning circuits have shown that SIS mixers can work well up to twice the gap frequency of the junction material (niobium). However, the performance at 1 THz is limited by the substantial loss in the normal metal films. For better performance superconducting films with a higher gap frequency than niobium and with low RF loss are needed. Niobium nitride has long been considered a good candidate material, but typical NbN films suffer from high RF loss. To circumvent this problem we are currently investigating the RF loss in NbTiN films, a 15K Tc compound superconductor, by incorporating them into quasi-optical slot antenna SIS devices.

Additional Information

© 1998 Plenum Publishing Corporation. Received January 7, 1998. This work was supported in part by NASA grants NAG5-4890 and NAGW-107, NAG2-1068, the NASA/JPL Center for Space Microelectronics Technology and the Caltech Submillimeter (NSF grant AST-9615025).

Additional details

Created:
August 19, 2023
Modified:
March 5, 2024