Nonequilibrium theory of a hot-electron bolometer with normal metal-insulator-superconductor tunnel junction
Nonequilibrium theory of a hot-electron bolometer with normal metal-insulator-superconductor tunnel junction
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DOI：
10.1063/1.1351002
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发表时间：
2001-06-01
影响因子：
3.2
通讯作者：
Kuzmin, L
中科院分区：
文献类型：
--
作者：
Golubev, D;Kuzmin, L
从理论上分析了采用普通金属-绝缘体-超导体(NIS)隧道结作为温度传感器的热电子测辐射热计的工作原理。对典型的实验参数进行了数值计算，得到了测辐射热计的响应度和噪声等效功率。导出了这些值相对简单的近似解析表达式。还求出了该装置的时间常数。我们证明了作为温度计的NiS结的电子冷却效应可以提高灵敏度。这种效应在有限背景功率负载存在的情况下也是有用的。我们讨论了散粒噪声和热流噪声在NIS结中的相关性的影响。(C)2001年美国物理研究所。
The operation of the hot-electron bolometer with normal metal-insulator-superconductor (NIS) tunnel junction as a temperature sensor is analyzed theoretically. The responsivity and the noise equivalent power (NEP) of the bolometer are obtained numerically for typical experimental parameters. Relatively simple approximate analytical expressions for these values are derived. The time constant of the device is also found. We demonstrate that the effect of the electron cooling by the NIS junction, which serves as a thermometer, can improve the sensitivity. This effect is also useful in the presence of the finite background power load. We discuss the effect of the correlation of the shot noise and the heat flow noise in the NIS junction. (C) 2001 American Institute of Physics.