Bi-layer Kinetic Inductance Detectors for space observations between 80-120 GHz
Bi-layer Kinetic Inductance Detectors for space observations between 80-120 GHz
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用于 80-120 GHz 空间观测的双层动感电感探测器
DOI：
10.1051/0004-6361/201526206
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
A. Monfardini
中科院分区：
文献类型：
--
作者：
A. Catalano;J. Goupy;H. Sueur;A. Benoȋt;O. Bourrion;M. Calvo;A. D’Addabbo;L. Dumoulin;F. Levy;J. Macias;S. Marnieros;N. Ponthieu;A. Monfardini
我们开发了对 80 至 120GHz 频段敏感的集总元件动感电感探测器 (LEKID)。在这项工作中，我们利用所谓的邻近效应来减小铝的超导间隙，否则会强烈抑制小于 100~GHz 频率的 LEKID 响应。我们设计、生产并光学测试了各种基于铝 (Al) 和钛 (Ti) 多层组合的全复用阵列。它们的灵敏度是使用专用的闭环 100 mK 稀释低温恒温器和天空模拟器进行测量的，可以重现真实的观测条件。光谱响应已使用 Martin-Puplett 干涉仪进行了表征，频率高达太赫兹，分辨率为 3~GHz。我们证明 Ti-Al LEKID 的光学灵敏度可以达到约 $1.4$ $10^{-17}$~$W/Hz^{0.5}$（最佳像素），或者在整个阵列上平均时达到 $2.2$ $10^{-17}$~$W/Hz^{0.5}$ 的光学灵敏度。光学背景设置为每像素大约 0.4~pW，这是该特定波段未来空间天文台的典型值。该性能接近 100GHz 时 CMB 光子噪声极限两倍的灵敏度，这推动了普朗克 HFI 仪器的设计。这个数字仍然是下一代毫米波空间卫星的基线。
We have developed Lumped Element Kinetic Inductance Detectors (LEKID) sensitive in the frequency band from 80 to 120~GHz. In this work, we take advantage of the so-called proximity effect to reduce the superconducting gap of Aluminium, otherwise strongly suppressing the LEKID response for frequencies smaller than 100~GHz. We have designed, produced and optically tested various fully multiplexed arrays based on multi-layers combinations of Aluminium (Al) and Titanium (Ti). Their sensitivities have been measured using a dedicated closed-circle 100 mK dilution cryostat and a sky simulator allowing to reproduce realistic observation conditions. The spectral response has been characterised with a Martin-Puplett interferometer up to THz frequencies, and with a resolution of 3~GHz. We demonstrate that Ti-Al LEKID can reach an optical sensitivity of about $1.4$ $10^{-17}$~$W/Hz^{0.5}$ (best pixel), or $2.2$ $10^{-17}$~$W/Hz^{0.5}$ when averaged over the whole array. The optical background was set to roughly 0.4~pW per pixel, typical for future space observatories in this particular band. The performance is close to a sensitivity of twice the CMB photon noise limit at 100~GHz which drove the design of the Planck HFI instrument. This figure remains the baseline for the next generation of millimetre-wave space satellites.
改进动感电感探测器的毫米波光度测定
影响因子：
6.5
作者：
Calvo M
通讯作者：
Calvo M