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Low-noise 0.5 THz all-NbN superconductor-insulator-superconductor mixer for submillimeter wave astronomy

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5 Author(s)
Jing Li ; Purple Mountain Observatory/Graduate School of CAS, Chinese Academy of Sciences, 2 West Beijing Road, Nanjing, Jiangsu 210008, People’s Republic of China ; Takeda, M. ; Zhen Wang ; Sheng-Cai Shi
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We report the detection of spectral line emission from CO (J=4–3) at 0.46 THz using a low-noise 0.5 THz superconductor-insulator-superconductor (SIS) mixer incorporating NbN/AlN/NbN tunnel junctions (with an energy gap of 5.6 meV) and a NbN/MgO/NbN tuning circuit, which is installed on a 30 cm submillimeter telescope. Uncorrected receiver noise temperatures as low as 149 K are measured on the telescope from 0.45–0.50 THz for an unoptimized device. Moreover, the 0.5 THz all-NbN SIS mixer exhibits high stability in a considerably large dc bias range and low noise at significantly high temperatures compared with a 0.5 THz Nb SIS mixer.

Published in:

Applied Physics Letters  (Volume:92 ,  Issue: 22 )

Date of Publication:

Jun 2008

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