Low-noise 0.5 THz all-NbN superconductor-insulator-superconductor mixer for submillimeter wave astronomy

被引：55
作者：
Li, Jing [1 ]
Takeda, Masanori [2 ]
Wang, Zhen [2 ]
Shi, Sheng-Cai
Yang, Ji
机构：
[1] Chinese Acad Sci, Grad Sch, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
[2] NiCT, Kobe Adv ICT Res Ctr, Nishi Ku, Kobe, Hyogo 6512492, Japan
来源：
APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 22期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1063/1.2940235
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report the detection of spectral line emission from CO (J=4-3) at 0.46 THz using a low-noise 0.5 THz superconductor-insulator-superconductor (SIS) mixer incorporating NbN/AlN/NbN tunnel junctions (with an energy gap of 5.6 meV) and a NbN/MgO/NbN tuning circuit, which is installed on a 30 cm submillimeter telescope. Uncorrected receiver noise temperatures as low as 149 K are measured on the telescope from 0.45-0.50 THz for an unoptimized device. Moreover, the 0.5 THz all-NbN SIS mixer exhibits high stability in a considerably large dc bias range and low noise at significantly high temperatures compared with a 0.5 THz Nb SIS mixer. (c) 2008 American Institute of Physics.
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页数：3
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