Terahertz detectors based on superconducting hot electron bolometers

被引：16

作者：

Jiang Yi ^{[1
]}

Jin BiaoBing ^{[1
]}

Xu WeiWei ^{[1
]}

Kang Lin ^{[1
]}

Chen Jian ^{[1
]}

Wu PeiHeng ^{[1
]}

机构：

[1] Nanjing Univ, Res Inst Superconductor Elect, Nanjing 210093, Jiangsu, Peoples R China

来源：

SCIENCE CHINA-INFORMATION SCIENCES | 2012年 / 55卷 / 01期

基金：

中国国家自然科学基金;

关键词：

terahertz heterodyne detector; hot electron bolometer; noise temperature; stability; intermediate frequency gain bandwidth; NOISE; RECEIVERS; MIXERS;

D O I：

10.1007/s11432-011-4513-3

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

Low noise terahertz (THz) heterodyne detectors based on superconducting niobium nitride (NbN) hot electron bolometers (HEBs) have been studied. The HEB consists of a planar antenna and an NbN bridge connecting across the antenna's inner terminals on a high-resistivity Si substrate. The double sideband noise temperatures at 4.2 K without corrections have been characterized from 0.65 to 3.1 THz. The excess quantum noise factor beta of about 4 has been obtained, which agrees well with the calculated value. Allan variance of the HEB has been measured, and Allan time up to 20 s is obtained using a microwave feedback method. Also, the intermediate frequency gain bandwidth (GBW) was measured using two different methods, resulting in same GBW value of about 3.5 GHz.

引用

页码：64 / 71

页数：8

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