高温超导约瑟夫森结太赫兹混频系统  

High temperature superconducting Josephson junction terahertz harmonic mixer system

作　　者：安德越[1] 许伟伟[1] 花涛[1] 郁梅[1] 蒋来[1] 陈健[1] 吴培亨[1] 

机构地区：[1]南京大学电子科学与工程学院超导电子学研究所,南京210093

出　　处：《强激光与粒子束》2013年第6期1519-1522,共4页High Power Laser and Particle Beams

基　　金：国家973项目;国家自然科学基金项目(61027008;11074114);中国工程物理研究院太赫兹科学技术基金项目(CAEPTHZ201206)

摘　　要：在小型脉冲管制冷机(工作温度约60K)上搭建了高温超导约瑟夫森结太赫兹谐波混频系统,并采取了一系列措施增强结与太赫兹波的耦合。所采取的措施主要有:研究不同基片对结的影响并最终选择MgO做为双晶结基片,设计平面周期对数天线,同时使用一个超半球硅透镜和两个离轴抛物面反射镜组成准光学系统。最终成功在小型脉冲管制冷机中获得结对623GHz太赫兹波的响应,并且成功进行24次谐波混频实验。We show a Josephosn junction terahertz harmonic mixer system, in which the high temperature superconducting （HTS） Josephson junction is set up on a cold figure in the small pulse-tube cryocooler working at the bath temperature of 60 K. We improved the experiments by several methods, such as choosing MgO as the substrate, assembling a well-designed planar logarithm periodic antenna to the junction, and using the quasi-optical system with one silicon hyper-hemispherical lens and two off-axis parabolic mirrors on the optical path. During the measurements, the sample was illuminated by a 623 GHz microwave source, and the Shapiro steps in the IV curves of YBCO/MgO bi-crystal junction were observed. The ultimate harmonic order is 24.

关 键 词：混频器 太赫兹 高温超导约瑟夫森结 小型脉冲管制冷机 准光系统 

分 类 号：TN773[电子电信—电路与系统]