Comparison of the THz Direct-Detection Behaviors of Nb and NbN Superconducting Tunnel Junctions

摘要：

Superconducting SIS (Superconductor -Insulator-Superconductor) tunnel junctions are promising application prospect in the incoherent detection of astronomy observation. In this paper,the direct detection performances of Nb and NbN based superconducting SIS junctions,which cover about 250 GHz and 140 GHz centered at 600 GHz respectively,are characterized at a bath temperature of 4.2K. The experiments show that Nb and NbN based SIS junctions have a current shot noise of 2.5×10-12 and 3.1X 10-12 A Hz,a current responsivity of 303 and 187 A/W (corresponding to the quantum efficiency of 0.67 and 0.43) respectively. Thus their respective NEPs are 8.4×10-15 and 1.7x10-14 W Hz.

作者: Xiao-Fang Shen Xue-Song Cao Jing Li Sheng-Cai Shi

作者单位: Purple Mountain Observatory,Chinese Academy of Science,Nanjing 210008,China;Graduate school of Chine Purple Mountain Observatory,Chinese Academy of Science,Nanjing 210008,China

会议类型: 国际会议

会议名称: 2008 Global Symposium on Millimeter Waves(GSMM 2008)(2008全球毫米波学术大会)

会议地点: 南京

会议语种:英文

页码: 94-97

在线出版日期: 2008-04-21（万方平台首次上网日期，不代表论文的发表时间）