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16 December 2022 Noise performance of a 200–280 GHz mixer with Nb-AlN-NbN superconducting tunnel junctions
Bo-Liang Liu, Dong Liu, Ming Yao, Jing Li, Sheng-Cai Shi, Artem Chekushkin, Michael Fominsky, Lyudmila Filippenko, Valery Koshelets
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Proceedings Volume 12324, Infrared, Millimeter-Wave, and Terahertz Technologies IX; 1232406 (2022) https://doi.org/10.1117/12.2642052
Event: SPIE/COS Photonics Asia, 2022, Online Only
Abstract
Superconductor–insulator–superconductor (SIS) mixers remain the choice of heterodyne mixers for single-dish telescopes and interferometers at millimeter and submillimeter wavelengths. Compared with conventional Nb/AlOx/Nb superconducting tunnel junctions, Nb/AlN/NbN ones have larger gap voltage and may reach critical-current density beyond 10kA/cm2, which are both of particularly interest in developing broadband SIS mixers. Here we report on the design and measurement of an SIS mixer based on Nb/AlN/NbN parallel connected twin junctions (PCTJ) incorporating NbTiN/SiO2/Al microstrip circuit. The junctions have a gap voltage of 3.18mV and a critical-current density of 15kA/cm2. The measured receiver noise temperature reach 5hν/kB among 200-260GHz band, and the mixer’s fractional bandwidth is about 40% centered at 230GHz.
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Bo-Liang Liu, Dong Liu, Ming Yao, Jing Li, Sheng-Cai Shi, Artem Chekushkin, Michael Fominsky, Lyudmila Filippenko, and Valery Koshelets "Noise performance of a 200–280 GHz mixer with Nb-AlN-NbN superconducting tunnel junctions", Proc. SPIE 12324, Infrared, Millimeter-Wave, and Terahertz Technologies IX, 1232406 (16 December 2022); https://doi.org/10.1117/12.2642052
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KEYWORDS
Receivers
Superconductors
Astronomy
Heterodyning
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