Low noise and wide bandwidth of NbN hot-electron bolometer mixers
Low noise and wide bandwidth of NbN hot-electron bolometer mixers
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DOI：
10.1063/1.3544050
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发表时间：
2011-01
影响因子：
4
通讯作者：
I. Tretyakov;S. Ryabchun;M. Finkel;A. Maslennikova;N. Kaurova;A. Lobastova;B. Voronov;G. Goltsman-G.-Goltsm
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文献类型：
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作者：
I. Tretyakov;S. Ryabchun;M. Finkel;A. Maslennikova;N. Kaurova;A. Lobastova;B. Voronov;G. Goltsman-G.-Goltsm
本文报道了由NbN热电子测辐射热计接收机在2.5THz波段获得的600 K（5 h ν/kB）的双边带噪声温度。考虑到驻波效应，该值在1-7 GHz的中频范围内是恒定的，这表明混频器具有超过7 GHz的前所未有的大噪声带宽。在超导转变处进行的增益带宽测量提供了对此的洞察。他们表明，带宽对混频器长度的依赖关系遵循的模型与扩散和声子冷却的热电子的HEB混频器。
We report a record double sideband noise temperature of 600 K (5hν/kB) offered by a NbN hot-electron bolometer receiver at 2.5 THz. Allowing for standing wave effects, this value was found to be constant in the intermediate frequency range 1–7 GHz, which indicates that the mixer has an unprecedentedly large noise bandwidth in excess of 7 GHz. The insight into this is provided by gain bandwidth measurements performed at the superconducting transition. They show that the dependence of the bandwidth on the mixer length follows the model for an HEB mixer with diffusion and phonon cooling of the hot electrons.