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18 November 2019 Analysis of RF-noise contribution in THz superconducting SIS mixers
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Superconductor-insulator-superconductor (SIS) mixers, with nearly quantum-limited sensitivity, have been playing an important role in Terahertz astronomy. For practical THz SIS receivers, however, the measured noise temperatures are sometimes higher than the expected value. The extra noise is mainly due to considerable RF noise contribution from the receiver components such as beam splitter, Dewar window, and infrared filter. In this paper, we mainly present the simulation and measurement results of the three components with different materials and thicknesses. Their noise contributions are also analyzed.
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Honghu Li, Wei-tao Lv, Liu Dong, Bo-wen Fan, Yao Ming, Bo-liang Liu, Li Jing, and Sheng-cai Shi "Analysis of RF-noise contribution in THz superconducting SIS mixers", Proc. SPIE 11196, Infrared, Millimeter-Wave, and Terahertz Technologies VI, 111960U (18 November 2019);

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