中国物理B ›› 2020, Vol. 29 ›› Issue (5): 58505-058505.doi: 10.1088/1674-1056/ab81f9
所属专题: SPECIAL TOPIC —Terahertz physics
Kang-Min Zhou(周康敏), Wei Miao(缪巍), Yue Geng(耿悦), Yan Delorme, Wen Zhang(张文), Yuan Ren(任远), Kun Zhang(张坤), Sheng-Cai Shi(史生才)
Kang-Min Zhou(周康敏)1,2, Wei Miao(缪巍)1,2, Yue Geng(耿悦)1,2,4, Yan Delorme3, Wen Zhang(张文)1,2, Yuan Ren(任远)1,2, Kun Zhang(张坤)1,2, Sheng-Cai Shi(史生才)1,2
摘要: We report on the investigation of optimal bias region of a wide-band superconducting hot electron bolometer (HEB) mixer in terms of noise temperature performance for multi-pixel heterodyne receiver application in the 5-meter Dome A Terahertz Explorer (DATE5) telescope. By evaluating the double sideband (DSB) receiver noise temperature (Trec) across a wide frequency range from 0.2 THz to 1.34 THz and with a large number of bias points, a broad optimal bias region has been observed, illustrating a good bias applicability for multipixel application since the performance of the HEB mixer is uniquely determined by each bias point. The noise temperature of the HEB mixer has been analyzed by calibrating the noise contribution of all RF components, whose transmissions have been measured by a time-domain spectroscopy. The corrected noise temperature distribution shows a frequency independence relation. The dependence of the optimal bias region on the bath temperature of the HEB mixer has also been investigated, the bath temperature has limited effect on the lowest receiver noise temperature until 7 K, however the optimal bias region deteriorates obviously with increasing bath temperature.
中图分类号: (Superconducting infrared, submillimeter and millimeter wave detectors)