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首页> 外文会议>Conference on Terahertz Photonics; 20071112-14; Beijing(CN) >Dependence of noise temperature of quasi-optical superconducting hot-electron bolometer mixers on bath temperature and optical-axis displacement
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Dependence of noise temperature of quasi-optical superconducting hot-electron bolometer mixers on bath temperature and optical-axis displacement

机译：准光学超导热电子辐射热混合器的噪声温度对浴温和光轴位移的依赖性

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摘要

It is known that the increase of bath temperature results in the decrease of critical current of superconducting hot-electron bolometer (HEB) mixers owing to the depression of superconductivity, thus leading to the degradation of the mixer's sensitivity. Here we report our study on the effect of bath temperature on the heterodyne mixing performance of quasi-optical superconducting NbN HEB mixers incorporated with a two-arm log-spiral antenna. The correlation between the bath temperature, critical current, LO power requirement and noise temperature is investigated at 0.5 THz. Furthermore, the heterodyne mixing performance of quasi-optical superconducting NbN HEB mixers is examined while there is an optical-axis displacement between the center of the extended hemispherical silicon lens and the superconducting NbN HEB device, which is placed on the back of the lens. Detailed experimental results and analysis are presented.
机译：众所周知，由于超导性的降低，熔池温度的升高会导致超导热电子辐射热测量（HEB）混合器的临界电流降低，从而导致混合器灵敏度下降。在这里，我们报告了浴温对结合了两臂对数螺旋天线的准光学超导NbN HEB混合器的外差混合性能的影响的研究。在0.5 THz的频率下研究熔池温度，临界电流，LO功率要求和噪声温度之间的相关性。此外，检查了准光学超导NbN HEB混合器的外差混合性能，同时在扩展的半球形硅透镜的中心与超导NbN HEB器件（位于透镜背面）之间存在光轴位移。介绍了详细的实验结果和分析。

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