HTS mixers based on the Josephson effect and on the hot-electron bolometric effect

• Published in: IEEE transactions on applied superconductivity Vol. 9; no. 2; pp. 3765 - 3768
• Main Authors: Harnack, O., Beuven, S., Darula, M., Kohlstedt, H., Tarasov, M., Stephansov, E., Ivanov, Z.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01-06-1999; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Bandwidth; Bicrystals; Bolometers; Circuit properties; Devices; Electric, optical and optoelectronic circuits; Electrodes; Electronics; Exact sciences and technology; Frequency conversion; Frequency measurement; Frequency ranges; High temperature superconductors; Josephson effect; Josephson junctions; Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits; Mixers; Noise measurement; Performance evaluation; Phonons; Sapphire; Temperature dependence; Millimetric wave; Experimental result; Josephson effect; Sapphire; Submillimetric wave; Bandwidth; Bolometer; Wave detection; Hot electron; High temperature superconductor; Bicrystal
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/77.783847

We report on our experimental studies of high-T/sub c/ Josephson mixers and high-T/sub c/ hot-electron bolometric (HEB) effect mixers. Mixers based on high-T/sub c/ bicrystal Josephson junctions have been fabricated, and noise, conversion efficiency, and receiver bandwidth measurements have been performed in the frequency range between 90 and 550 GHz. The dependence of the mixer performance on the operation temperature has been studied. High-T/sub c/ HEB mixers have been fabricated on MgO and sapphire substrates. We successfully sized the dimensions of the effective device volume down and managed to fabricate 50-60 nm long devices. In such short structures phonon diffusion into the normal metal electrodes should significantly improve the mixer performance.