Terahertz detectors based on superconducting hot electron bolometers  

作　　者：JIANG Yi JIN BiaoBing XU WeiWei KANG Lin CHEN Jian WU PeiHeng 

机构地区：[1]Research Institute of Superconductor Electronics,Nanjing University,Nanjing 210093,China

出　　处：《Science China(Information Sciences)》2012年第1期64-71,共8页中国科学（信息科学）（英文版）

基　　金：supported by National Basic Research Program of China(Grant Nos.2007CB310404,2011CBA01007);National Natural Science Foundation of China(Grant No.11173015);Doctoral Funds of the Ministry of Education of China(Grant No.20090091110039)

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 3 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 CHz.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 3 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 CHz.

关 键 词：terahertz heterodyne detector hot electron bolometer noise temperature stability intermediatefrequency gain bandwidth 

分 类 号：TN215[电子电信—物理电子学] O451[理学—无线电物理]