Noise temperature distribution of superconducting hot electron bolometer mixers

Zhou Kang-Min^{1, 2}, Miao Wei^{1, 2}, Geng Yue^{1, 2, 4}, Delorme Yan³, Zhang Wen^{1, 2}, Ren Yuan^{1, 2}, Zhang Kun^{1, 2}, Shi Sheng-Cai^{1, 2, †}

Measured R–T curve of the superconducting HEB mixer. The inset presents the SEM picture of the log-spiral antenna coupled HEB device. The light gray area is the planar antenna, and the dark gray area is the Si substrate.