Characterization of the Mixing Performance of All-NbN Superconducting Tunnel Junctions at 0.5 THz

被引：9
|
作者：
Li, Jing [1 ,2 ]
Takeda, Masanori [3 ]
Wang, Zhen [3 ]
Shi, Sheng-Cai [1 ]
机构：
[1] Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
[2] Chinese Acad Sci, Grad Sch, Nanjing 210008, Jiangsu, Peoples R China
[3] NiCT, Kobe Adv ICT Res Ctr, Kobe, Hyogo, Japan
来源：
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2009年 / 19卷 / 03期
关键词：
Aging effect; NbN; stability; superconductor-insulator-superconductor mixers; terahertz;
D O I：
10.1109/TASC.2009.2018504
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
With a gap frequency of 1.4 THz, all-NbN Superconductor-Insulator-Superconductor (SIS) junctions are potentially applicable to sensitive heterodyne mixers for THz astronomy and atmospheric research. In this paper, we report the design, fabrication, and performance characterization of a 0.5-THz waveguide SIS mixer incorporating twin NbN/AlN/NbN junctions and an NbN/MgO/NbN tuning circuit with no impedance transformers. The noise performance of two NbN SIS junctions with different tuning inductances is measured, compared with the simulated results without and with the multiple Andreev reflection (MAR) effect taken into account, and also compared with the video detection response. In addition, the IF-output-power stability and aging effect of fabricated NbN SIS junctions are investigated.
引用
收藏
页码：417 / 422
页数：6
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