Terahertz high-sensitivity SIS mixer based on Nb–AlN–NbN hybrid superconducting tunnel junctions  

作　　者：刘博梁 刘冬 姚明 金骏达 王争 李婧 史生才 Artem Chekushkin Michael Fominsky Lyudmila Filippenko Valery Koshelets Bo-Liang Liu;Dong Liu;Ming Yao;Jun-Da Jin;Zheng Wang;Jing Li;Sheng-Cai Shi;Artem Chekushkin;Michael Fominsky;Lyudmila Filippenko;Valery Koshelets(Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China;School of Astronomy and Space Sciences,University of Science and Technology of China,Hefei 230026,China;Kotel'nikov Institute of Radio Engineering and Electronics,Russian Academy of Sciences,Moscow 125009,Russia)

机构地区：[1]Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China [2]School of Astronomy and Space Sciences,University of Science and Technology of China,Hefei 230026,China [3]Kotel'nikov Institute of Radio Engineering and Electronics,Russian Academy of Sciences,Moscow 125009,Russia

出　　处：《Chinese Physics B》2024年第5期681-686,共6页中国物理B（英文版）

基　　金：Project supported in part by the National Key Research and Development Program of China(Grant Nos.2023YFA1608201 and 2023YFF0722301);the National Natural Science Foundation of China(Grant Nos.11925304,12020101002,12333013,12273119,and 12103093);supported by grant from the Russian Science Foundation(Grant No.23-7900019)。

摘　　要：The terahertz band,a unique segment of the electromagnetic spectrum,is crucial for observing the cold,dark universe and plays a pivotal role in cutting-edge scientific research,including the study of cosmic environments that support life and imaging black holes.High-sensitivity superconductor–insulator–superconductor(SIS)mixers are essential detectors for terahertz astronomical telescopes and interferometric arrays.Compared to the commonly used classical Nb/AlO_(x)/Nb superconducting tunnel junction,the Nb/AlN/NbN hybrid superconducting tunnel junction has a higher energy gap voltage and can achieve a higher critical current density.This makes it particularly promising for the development of ultra-wideband,high-sensitivity coherent detectors or mixers in various scientific research fields.In this paper,we present a superconducting SIS mixer based on Nb/AlN/NbN parallel-connected twin junctions(PCTJ),which has a bandwidth extending up to490 GHz–720 GHz.The best achieved double-sideband(DSB)noise temperature(sensitivity)is below three times the quantum noise level.

关 键 词：SIS mixer TERAHERTZ gap voltage critical current density hybrid superconducting tunnel junction 

分 类 号：O441.4[理学—电磁学] TN773[理学—物理]