Direct detection effect in small volume hot electron bolometer mixers
Direct detection effect in small volume hot electron bolometer mixers
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DOI：
10.1063/1.1887812
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发表时间：
2005-04
影响因子：
4
通讯作者：
J. Baselmans;A. Baryshev;S. Reker;M. Hajenius;Jiansong Gao;T. Klapwijk;Y. Vachtomin;S. Maslennikov;S. Antipov;B. Voronov;G. Gol'tsman
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文献类型：
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作者：
J. Baselmans;A. Baryshev;S. Reker;M. Hajenius;Jiansong Gao;T. Klapwijk;Y. Vachtomin;S. Maslennikov;S. Antipov;B. Voronov;G. Gol'tsman
在小体积（0.15 μ m × 1 μ m × 3.5nm）NbN声子冷却热电子测辐射热计混频器中测量了1.6THz的直接探测效应。我们发现，接收机的小信号灵敏度被低估了35%，由于直接检测效果和最佳工作点被转移到更高的偏置电压时，使用300K和77K的校准负载。在4.2K下使用200GHz带通滤波器，直接检测效应几乎消失。这对真实的望远镜系统中这些接收机的校准过程具有重要意义。
We measure the direct detection effect in a small volume (0.15μm×1μm×3.5nm) quasioptical NbN phonon cooled hot electron bolometer mixer at 1.6THz. We find that the small signal sensitivity of the receiver is underestimated by 35% due to the direct detection effect and that the optimal operating point is shifted to higher bias voltages when using calibration loads of 300K and 77K. Using a 200GHz bandpass filter at 4.2K the direct detection effect virtually disappears. This has important implications for the calibration procedure of these receivers in real telescope systems.