Abstract
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/A1OA/Nb super-conducting 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 superconduct-ing SIS mixer based on Nb/AlN/NbN parallel-connected twin junctions(PCTJ),which has a bandwidth extending up to 490 GHz-720 GHz.The best achieved double-sideband(DSB)noise temperature(sensitivity)is below three times the quantum noise level.
基金项目
国家重点研发计划(2023YFA1608201)
国家重点研发计划(2023YFF0722301)
国家自然科学基金(11925304)
国家自然科学基金(12020101002)
国家自然科学基金(12333013)
国家自然科学基金(12273119)
国家自然科学基金(12103093)
Russian Science Foundation(23-79-00019)
NETL
NSTL
万方数据