Low noise NbN lattice-cooled superconducting hot-electron bolometric mixers at submillimeter wavelengths
Low noise NbN lattice-cooled superconducting hot-electron bolometric mixers at submillimeter wavelengths
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亚毫米波长低噪声 NbN 晶格冷却超导热电子测辐射热混合器
DOI：
10.1063/1.118634
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发表时间：
1997
影响因子：
4
通讯作者：
S. Cherednichenko
中科院分区：
文献类型：
--
作者：
J. Kawamura;R. Blundell;C. Tong;G. Goltsman;E. Gershenzon;B. Voronov;S. Cherednichenko
在亚毫米波波导外差接收机中采用了点阵冷却超导热电子测热混频器。混合元件为氮化铌薄膜，厚度为3.5 nm，面积为~ 10 μm2。最优性能的本振功率为0.5 μW，瞬时带宽为2.2 GHz。在以1.4 GHz为中心、带宽为200 MHz的中频下，430ghz时的双边带接收机噪声温度为410 K。该接收器已用于实验室气体电池的分子线发射检测。
Lattice-cooled superconducting hot-electron bolometric mixers are used in a submillimeter-wave waveguide heterodyne receiver. The mixer elements are niobium nitride film with 3.5 nm thickness and ∼10 μm2 area. The local oscillator power for optimal performance is estimated to be 0.5 μW, and the instantaneous bandwidth is 2.2 GHz. At an intermediate frequency centered at 1.4 GHz with 200 MHz bandwidth, the double sideband receiver noise temperature is 410 K at 430 GHz. The receiver has been used to detect molecular line emission in a laboratory gas cell.