High temperature superconducting Josephson junction terahertz harmonic mixer system

An Deyue; Xu Weiwei; Hua Tao; Yu Mei; J iang Lai; Chen Jian; Wu Peiheng

doi:10.3788/HPLPB20132506.1519

Volume 25 Issue 06

Apr. 2013

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An Deyue, Xu Weiwei, Hua Tao, et al. High temperature superconducting Josephson junction terahertz harmonic mixer system[J]. High Power Laser and Particle Beams, 2013, 25: 1519-1522. doi: 10.3788/HPLPB20132506.1519

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An Deyue, Xu Weiwei, Hua Tao, et al. High temperature superconducting Josephson junction terahertz harmonic mixer system[J]. High Power Laser and Particle Beams, 2013, 25: 1519-1522. doi: 10.3788/HPLPB20132506.1519

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High temperature superconducting Josephson junction terahertz harmonic mixer system

doi: 10.3788/HPLPB20132506.1519

1.
Research Institute of Superconductor Electronics,School of Electronic Science and Engineering,Nanjing University,Nanjing 210093,China

Received Date: 2012-11-09
Rev Recd Date: 2013-01-09
Publish Date: 2013-04-08

Abstract

Abstract

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.
- mixer,
- terahertz,
- high-temperature superconducting Josephson junction,
- small pulse-tube cryocooler,
- quasi-optical system

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