QUASI-PARTICLE HETERODYNE MIXING IN SIS TUNNEL-JUNCTIONS

被引：99

作者：

RICHARDS, PL ^{[1
]}

SHEN, TM ^{[1
]}

HARRIS, RE ^{[1
]}

LLOYD, FL ^{[1
]}

机构：

[1] NBS,BOULDER,CO 80303

来源：

APPLIED PHYSICS LETTERS | 1979年 / 34卷 / 05期

关键词：

D O I：

10.1063/1.90782

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The rapid onset of quasiparitcle tunneling current in superconductor- insulator-superconductor (Josephson) junctions at voltages above 2Δ/e is being used for millimeter-wave heterodyne mixing. Junctions with a 2-μm diameter and RN=50 Ω have little capacitive shunting at the signal frequency of 36 GHz. Because there is no series resistance, residual capacitance can be tuned out. Double sideband conversion efficiencies of 0.32 and mixer noise temperatures as low as TM≤7 K=4hν/k have been observed. The results are compared with shot-noise-limited mixer theory. Photon-assisted tunneling effects are seen which indicate the approach to photon-noise-limited operation.

引用

页码：345 / 347

页数：3

共 9 条

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