An Anomalous Peak on Intermediate Frequency Response of Superconductor-Isolator-Superconductor Mixers and Its Effect on Mixing Performance

In this paper, we mainly investigate the origin and impact of an anomalous peak observed on the intermediate frequency (IF) response of some 600 GHz Nb superconductor-isolator-superconductor (SIS) mixers. The dependences of the IF peak on temperature and magnetic field are studied to verify its Jose...

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Bibliographic Details
Published in:	Japanese Journal of Applied Physics Vol. 43; no. 5A; p. L617
Main Authors:	Shan, Wenlei, Wang, Mingjye, Shi, Shengcai, Irimajiri, Yoshihisa, Noguchi, Takeshi
Format:	Journal Article
Language:	English
Published:	01-05-2004
Online Access:	Get full text
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Summary:	In this paper, we mainly investigate the origin and impact of an anomalous peak observed on the intermediate frequency (IF) response of some 600 GHz Nb superconductor-isolator-superconductor (SIS) mixers. The dependences of the IF peak on temperature and magnetic field are studied to verify its Josephson-junction-like behavior. The cross sections of two SIS junction samples are analyzed by transmission electron microscopy to locate this parasitic Josephson weak link. Five different junction samples are measured to determine the impact of the Josephson weak link on the mixer performance. Finally, an equivalent circuit model is proposed to explain its behavior.
ISSN:	0021-4922 1347-4065
DOI:	10.1143/JJAP.43.L617