Low Noise Receivers Based on Superconducting Niobium Nitride Hot Electron Bolometer Mixers from 0.65 to 3.1 Terahertz
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概要
- 論文の詳細を見る
Low noise terahertz (THz) receivers based on superconducting niobium nitride (NbN) hot electron bolometer (HEB) mixers have been designed, fabricated and measured for applications in astronomy and cosmology. The NbN HEB mixer consists of a planar antenna and an NbN bridge connecting across the antennas inner terminals on a high-resistivity Si substrate. To eliminate the influence of direct detection and instability of the local oscillation (LO) power, a wire grid has been used to change the input LO power for compensating the shift of bias current during Y-factor measurement. The double sideband (DSB) receiver noise temperatures at 4.2K without corrections have been measured from 0.65 to 3.1THz. The excess quantum noise factor β of about 4 has been obtained, which agrees well with the calculated value. Allan variance of the HEB has been characterized, and Allan time TA longer than 0.4s is obtained. We also estimated the temperature resolution of the HEB from the Allan variance and obtained the minimum temperature resolution of 1.1K using a Gunn oscillator with its multipliers at 0.65THz as an LO source.
- 2010-04-01
著者
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CHEN Jian
Research Institute of Electrical Communication, Tohoku University
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KANG Lin
Research Institute of Superconductor Electronics (RISE), Department of Electronic Science and Engine
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WU Peiheng
Research Institute of Electrical Communication, Tohoku University
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Kang Lin
Research Institute Of Superconductor Electronics (rise) Nanjing University
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Kang Lin
Research Institute Of Superconductor Electronics (rise) Department Of Electronic Science And Enginee
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Wu Peiheng
Research Institute Of Electrical Communication Tohoku University:department Of Electronic Science An
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Wu Peiheng
Research Institute Of Superconductor Electronics (rise) Nanjing University
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Chen Jian
Research Institute Of Superconductor Electronics (rise) Nanjing University
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LIANG Min
Research Institute of Superconductor Electronics (RISE), Nanjing University
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JIN Biaobing
Research Institute of Superconductor Electronics (RISE), Nanjing University
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XU Weiwei
Research Institute of Superconductor Electronics (RISE), Nanjing University
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Xu Weiwei
Research Institute Of Superconductor Electronics (rise) Nanjing University
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Liang Min
Research Institute Of Superconductor Electronics (rise) Nanjing University
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Jin Biaobing
Research Institute Of Superconductor Electronics (rise) Nanjing University
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Chen Jian
Research Center For Analysis And Measurement Fudan University
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Chen Jian
Nanjing University
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Kang Lin
Nanjing University
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Wu Peiheng
Nanjing University
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