Spectral response and noise temperature of a 2.5 THz spiral antenna coupled NbN HEB mixer
Spectral response and noise temperature of a 2.5 THz spiral antenna coupled NbN HEB mixer
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DOI：
10.1016/j.phpro.2012.06.169
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
W. Zhang;W. Miao;Q. Yao;Z. H. Lin;S. Shi;J. Gao;G. Gol’tsman
中科院分区：
文献类型：
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作者：
W. Zhang;W. Miao;Q. Yao;Z. H. Lin;S. Shi;J. Gao;G. Gol’tsman
我们报告了一种采用原位工艺制造的 2.5 THz 螺旋天线耦合 NbN 热电子测辐射热计 (HEB) 混频器。最低值为 1180K 的接收器噪声温度与计算得出的作为偏置电压函数的量子效率因子非常吻合。此外，测得的螺旋天线耦合 NbN HEB 混频器的光谱响应显示出 0.8-3 THz 的宽频率覆盖范围，并且由于透镜/天线组合的衍射极限光束，光学损耗、FTS 以及天线和测辐射热计之间的耦合效率的校正响应随频率下降。
We report on a 2.5 THz spiral antenna coupled NbN hot electron bolometer (HEB) mixers, fabricated with in-situ process. The receiver noise temperature with lowest value of 1180K is in good agreement with calculated quantum efficiency factor as a function of bias voltage. In addition, the measured spectral response of the spiral antenna coupled NbN HEB mixer shows broad frequency coverage of 0.8-3 THz, and corrected response for optical losses, FTS, and coupling efficiency between antenna and bolometer falls with frequency due to diffraction-limited beam of lens/antenna combination.