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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. https://resolver.caltech.edu/CaltechAUTHORS:20200728-174942088

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1023/a:1022595223782DOIArticle
ORCID:
AuthorORCID
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).
Funders:
Funding AgencyGrant Number
NASANAG5-4890
NASANAGW-107
NASANAG2-1068
NSFAST-9615025
Subject Keywords:NbTiN superconducting films, SIS junctions, Niobium bandgap
Issue or Number:3
Record Number:CaltechAUTHORS:20200728-174942088
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200728-174942088
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
Collection:CaltechAUTHORS
Deposited By: Rebecca Minjarez
Deposited On:04 Aug 2020 15:42
Last Modified:04 Aug 2020 15:42

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