Heterodyne mixing with Nb tunnel junctions above the gap frequency
Heterodyne mixing with Nb tunnel junctions above the gap frequency
复制标题
与高于间隙频率的铌隧道结进行外差混合
DOI：
10.1063/1.111399
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发表时间：
1994
影响因子：
4
通讯作者：
M. D. Graauw
中科院分区：
文献类型：
--
作者：
G. Lange;C. Honingh;J. Kuipers;H. Schaeffer;R. Panhuyzen;T. Klapwijk;H. Stadt;M. D. Graauw
在680-750 GHz和840 GHz下测量和分析了采用Nb/Al 2 O3/Nb超导隧道结和片上集成调谐元件的外差波导混频器的噪声和增益。最低接收机噪声温度在720 GHz时为400 K（双边带），在840 GHz时为1500 K（3000 K，包括分束器损耗）。我们比较了泵浦的I-V曲线的数据与量子理论的混合，并表现出良好的协议，在频率远高于差距频率。
The noise and gain of a heterodyne waveguide mixer employing Nb/Al2O3/Nb superconducting tunnel junctions with an on‐chip integrated tuning element are measured and analyzed at 680–750 GHz and at 840 GHz. The lowest receiver noise temperatures are 400 K (double side band) at 720 GHz and 1500 K (3000 K including the beam splitter loss) at 840 GHz. We compare data of the pumped I–V curves with the quantum theory of mixing and demonstrate good agreement at frequencies well above the gap frequency.