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Low-loss NbTiN films for THz SIS mixer tuning circuts

Kooi, J. W. and Stern, J. A. and Chattopadhyay, G. and LeDuc, H. G. and Bumble, B. and Zmuidzinas, J. (1998) Low-loss NbTiN films for THz SIS mixer tuning circuts. International Journal of Infrared and Millimeter Waves, 19 (3). pp. 373-383. ISSN 0195-9271. doi:10.1023/a:1022595223782.

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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.

Item Type:Article
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Kooi, J. W.0000-0002-6610-0384
Chattopadhyay, G.0000-0001-7942-5025
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).
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Subject Keywords:NbTiN superconducting films, SIS junctions, Niobium bandgap
Issue or Number:3
Record Number:CaltechAUTHORS:20200728-174942088
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Official Citation:Kooi, J.W., Stern, J.A., Chattopadhyay, G. et al. Low-Loss NbTiN Films for THz SIS Mixer Tuning Circuits. International Journal of Infrared and Millimeter Waves 19, 373–383 (1998).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104625
Deposited By: Rebecca Minjarez
Deposited On:04 Aug 2020 15:42
Last Modified:16 Nov 2021 18:33

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