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

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 毫米波和亚毫米波技术实验室

	Performance of Terahertz Waveguide SIS Mixers Employing Epitaxial NbN Films and Nb Junctions
	Kojima, Takafumi 1,2; Kroug, Matthias 2; Takeda, Masanori 3; Shan, Wenlei ; Fujii, Yasunori 2; Uzawa, Yoshinori 2; Wang, Zhen 3,4; Shi, Shengcai4
刊名	IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
	2009-06-01
卷号	19 期号:3 页码:405-408
关键词	Atacama large millimeter array niobium nitride SIS mixers submillimeter wave
ISSN号	1051-8223
英文摘要	We have designed, fabricated, and tested terahertz waveguide superconductor-insulator-superconductor (SIS) mixers with Nb/AlO(x)/Nb junctions and NbN/SiO(2)/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/cm(2) showed good 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.
学科主题	Engineering; Physics
WOS标题词	Science & Technology ; Technology ; Physical Sciences
类目[WOS]	Engineering, Electrical & Electronic ; Physics, Applied
研究领域[WOS]	Engineering ; Physics
关键词[WOS]	MILLIMETER ; DESIGN
收录类别	SCI ; ISTP
语种	英语
WOS记录号	WOS:000268282000065
公开日期	2011-12-08
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/1697]
专题	紫金山天文台_毫米波和亚毫米波技术实验室
作者单位	1.Osaka Prefecture Univ, Naka Ku, Osaka 5998531, Japan 2.Natl Observ Japan, Mitaka, Tokyo 1818588, Japan 3.Natl Inst Informat & Commun Technol, Nishi Ku, Kobe, Hyogo 6512492, Japan 4.Natl Astron Observ, Purple Mt Observ, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Kojima, Takafumi,Kroug, Matthias,Takeda, Masanori,et al. Performance of Terahertz Waveguide SIS Mixers Employing Epitaxial NbN Films and Nb Junctions[J]. IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY,2009,19(3):405-408.
APA	Kojima, Takafumi.,Kroug, Matthias.,Takeda, Masanori.,Shan, Wenlei.,Fujii, Yasunori.,...&Shi, Shengcai.(2009).Performance of Terahertz Waveguide SIS Mixers Employing Epitaxial NbN Films and Nb Junctions.IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY,19(3),405-408.
MLA	Kojima, Takafumi,et al."Performance of Terahertz Waveguide SIS Mixers Employing Epitaxial NbN Films and Nb Junctions".IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 19.3(2009):405-408.