Multiplexable Kinetic Inductance Detectors
Multiplexable Kinetic Inductance Detectors
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多路复用动感电感探测器
DOI：
10.1063/1.1457652
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
H. Leduc
中科院分区：
文献类型：
--
作者：
B. Mazin;P. Day;J. Zmuidzinas;H. Leduc
我们开始研究一种新的可复用读出方法，该方法可应用于一大类超导对破坏探测器。这种读出方法与目前用于超导隧道结（STJ）和超导转变边缘传感器（TES）探测器的方法完全不同，并且原则上可以提供大量像素、高灵敏度以及受费米分布限制的光谱分辨率。这种读出基于这样一个事实：即使在远低于临界温度\(T_c\)的温度下，超导体的动生表面电感\(L_s\)也是准粒子密度\(n\)的函数。测量动生电感变化的一种有效方法是监测谐振电路的传输相位。通过在微波频率下工作并使用薄膜，动生电感可以成为总电感\(L\)的重要组成部分，并且电感的体积可以做得非常小，大约为\(1\ \mu m^3\)。与其他超导探测器一样，可以利用俘获将准粒子集中到电感的小体积内。然而，该概念最吸引人的方面是，可以使用无源频率复用技术，用单个高电子迁移率晶体管（HEMT）放大器读出约\(10^3\)个探测器。
We are starting to investigate a novel multiplexable readout method that can be applied to a large class of superconducting pair-breaking detectors. This readout method is completely different from those currently used with STJ and TES detectors, and in principle could deliver large pixel counts, high sensitivity, and Fano-limited spectral resolution. The readout is based on the fact that the kinetic surface inductance L_s of a superconductor is a function of the density of quasiparticles n, even at temperatures far below T_c. An efficient way to measure changes in the kinetic inductance is to monitor the transmission phase of a resonant circuit. By working at microwave frequencies and using thin films, the kinetic inductance can be a significant part of the total inductance L, and the volume of the inductor can be made quite small, on the order of 1 µm^3. As is done with other superconducting detectors, trapping could be used to concentrate the quasiparticles into the small volume of the inductor. However, the most intriguing aspect of the concept is that passive frequency multiplexing could be used to read out ~10^3 detectors with a single HEMT amplifier.