Noise temperature distribution of superconducting hot electron bolometer mixers

doi:10.1088/1674-1056/ab81f9

Abstract 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 (T_rec) 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.

Keywords: superconducting hot electron bolometer (HEB) mixer noise temperature distribution bath temperature dependence frequency dependence

Received: 09 December 2019
Revised: 17 January 2020
Accepted manuscript online:

PACS:	85.25.Pb	(Superconducting infrared, submillimeter and millimeter wave detectors)
	85.25.Am	(Superconducting device characterization, design, and modeling)

Fund: Project supported by the Chinese Academy of Sciences (Grant Nos. GJJSTD20180003 and QYZDJ-SSW-SLH043), the National Key Basic Research and Development Program of China (Grant Nos. 2017YFA0304003 and 2018YFA0404701), the National Natural Science Foundation of China (Grant Nos. 11603081, 11673073, U1831202, and 11873099), and PICS projects between the CAS and the CNRS.

Corresponding Authors: Sheng-Cai Shi
E-mail: scshi@pmo.ac.cn

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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) Noise temperature distribution of superconducting hot electron bolometer mixers 2020 Chin. Phys. B 29 058505

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Noise temperature distribution of superconducting hot electron bolometer mixers

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