Optical response of a cold-electron bolometer array
Optical response of a cold-electron bolometer array
复制标题
冷电子测辐射热计阵列的光学响应
DOI：
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发表时间：
2010
影响因子：
1.8
通讯作者：
A. Ermakov
中科院分区：
文献类型：
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作者：
Mikhail Tarasov;Mikhail Tarasov;L. Kuzmin;Valerian S. Edelman;N. Kaurova;M. Fominskii;A. Ermakov
研制了一种多元件测辐射热接收器系统，用于测量计算频率为345 GHz的辐射功率和偏振。十串并联冷电子测辐射热计阵列已被成对集成到交叉缝隙天线的正交端口。阵列在高频输入信号中并联连接，在输出信号中串联连接，输出信号在低频和直流偏置下测量。这样的阵列使得在相同的高频匹配条件下，与单个测辐射热计相比，可以将输出电阻增加两个数量级，并且可以优化与JFET放大器阻抗的匹配，高达几十兆欧。并联连接可确保输入信号与十字槽天线的匹配，十字槽天线的阻抗为30 Ω，位于一个大型硅介质透镜上。在100 mK的温度下，对覆盖天线的输入孔径并被加热到3 K的发射率为0.3的热辐射源的热辐射的响应为25 μV/K。考虑到真实的噪声，光波动直流灵敏度为5 mK，对应于放大器噪声的估计灵敏度约为10−4 K/Hz 1/2，噪声等效功率约为（1-5）× 10−17 W/Hz 1/2。
A multielement bolometric receiver system has been developed to measure the power and polarization of radiation at a calculated frequency of 345 GHz. Arrays of ten series-parallel connected cold-electron bolometers have been pairwise integrated into orthogonal ports of a cross-slot antenna. Arrays are connected in parallel in the high-frequency input signal and in series in the output signal, which is measured at a low frequency, and in a dc bias. Such an array makes it possible to increase the output resistance by two orders of magnitude as compared to an individual bolometer under the same conditions of high-frequency matching and to optimize the matching with the JFET amplifier impedance up to dozens of megohms. Parallel connection ensures matching of the input signal to the cross-slot antenna with an impedance of 30 Ω on a massive silicon dielectric lens. At a temperature of 100 mK, a response to the thermal radiation of a thermal radiation source with an emissivity of 0.3, which covers the input aperture of the antenna and is heated to 3 K, is 25 μV/K. Taking into account real noise, the optical fluctuation dc sensitivity is 5 mK, the estimated sensitivity corresponding to the noise of the amplifier is about 10−4 K/Hz1/2, and the noise-equivalent power is about (1–5) × 10−17 W/Hz1/2.