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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Harmonic mixing in high-Tc YBCO Josephson junctions at 94GHz

Yoshizumi Yasuoka, Kyojiro Kawaguchi, Takashi Nozue, J. Chen, T. Yamashita

Published Jan 1, 1992• 0 citations
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International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)•Sep 1, 2019•0 citations
Two high-Tc superconducting (HTS) YBa2Cu3O7-δ(YBCO) grain boundary (GB) Josephson junctions in series as a harmonic mixer is investigated. The research shows that the mixer consisting of two series YBCO Josephson junctions has a larger harmonic number than that with only one junction in heterodyne mixing at zero-voltage bias. One of the advantages of the series-Josephson-junction mixer is that the total critical current is improved without sacrificing the sensitivity of the junctions in the array that makes the mixer easier to get more microwave induced-steps required by larger harmonic number. Furthermore, the underdamped YBCO GB series-Josephson-junction mixer operated at zero-bias voltage, where the zero-order Shapiro step exists, achieves mutual phase locking of the junctions in the array, resulting in an excellent mixing performance. Thus, the series-underdamp-Josephson-junction mixer with zero bias is predominant and compact in terahertz (THz) application due to its excellent performance and no dc bias supply.