ISSTT Proceedings

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Low-Loss NbTiN Films for THz SIS Mixer Tuning Circuits

Authors:
J. W. Kooi, J. A. Stern, G. Chattopadhyay, H. G. LeDuc, B. Bumble, J. Zmuidzinas
Abstract:
Recent results at I 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.
Categories:
Devices, Receivers
Year:
1998
Session:
7
Full-text:
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Page Number(s):
283-294