NDLI: Performance of Terahertz Waveguide SIS Mixers Employing Epitaxial NbN Films and Nb Junctions

Content Provider	IEEE Xplore Digital Library
Author	Kojima, T. Kroug, M. Takeda, M. Wenlei Shan Fujii, Y. Uzawa, Y. Zhen Wang Shengcai Shi
Copyright Year	2002
Abstract	We have designed, fabricated, and tested terahertz waveguide superconductor-insulator-superconductor (SIS) mixers with Nb/AlO_x/Nb junctions and NbN/SiO₂/Al microstriplines. The NbN ground plane used was an epitaxial film grown on a single-crystal MgO substrate. A two-junction tuning circuit, which was directly placed at the feed point of a bow-tie waveguide probe without impedance transformers, was used. A full-height waveguide, hammer-type choke filter, and zero-depth backshort were adopted for the design of the microstrip-waveguide transition structure. The Nb junctions in which the current density was 6.5 kA/cm² showed good I-V characteristics, yielding a subgap-to-normal-state resistance ratio greater than 20. The results obtained for the mixer performance showed a receiver noise temperature of 440 K (DSB) at 1 THz; the results were corrected for losses in the beam splitter and the vacuum window. A detailed analysis of the mixers suggested that the waveguide mixers composed of epitaxial NbN films and Nb junctions were effective in the terahertz band.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	405
Ending Page	408
Page Count	4
File Size	585663
File Format	PDF
ISSN	10518223
Volume Number	19
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Waveguide junctions Niobium Superconducting films Circuit testing Superconducting epitaxial layers Josephson junctions Superconducting devices Microstrip Substrates Circuit optimization submillimeter wave Atacama large millimeter array niobium nitride SIS mixers
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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