一种高效率的超导芯片滤波器组用于亚毫米波段积分场单元的定向滤波器
A High Efficiency Superconducting On-chip Filterbank with Directional Filters for Integral Field Units in the Sub-millimeter Regime
AI总结：
本文提出了一种利用定向滤波器实现高效率的亚毫米波段滤波器组，实验结果显示其在125-220 GHz范围内达到75%的峰值耦合效率。
摘要：
集成超导光谱仪正在发展到能够实现积分场单元的阶段，为亚毫米波段的天文观测提供大范围光谱映射能力。然而，这些积分场单元只有在具有高效率的情况下才值得研究，但截至目前，芯片滤波器组的效率仍然很低。在这里，我们通过使用定向滤波器来演示一种高效率的滤波器组。利用低温热负荷和噪声测量，结合连续波太赫兹源，我们能够准确测量滤波器组的效率，考虑了我们设置中所有准光学元件。我们实验获得了一个在125 GHz到220 GHz之间稀疏采样的滤波器组的平均峰值耦合效率为75%，使用平均负载品质因子为19.6的滤波器。我们的结果表明，使用定向滤波器可以实现高效率的滤波器组，为高效积分场单元提供了明确的途径。
英文摘要：
Integrated superconducting spectrometers are developing to the point that they are enabling integral field units, providing large area spectral mapping capabilities for astronomy in the sub-millimeter band. However, these integral field units are only worthwhile if they have a high efficiency, but to date the efficiency of on-chip filterbanks has been quite poor. Here we demonstrate a filterbank with high efficiency by using directional filters. Using a cryogenic thermal load and a noise measurement in combination with a continuous-wave terahertz source to obtain the spectral response of the filters, we are able to accurately measure the filterbank efficiency, accounting for all quasi-optical elements within our setup. We experimentally obtain an average peak coupling efficiency to the detectors of 75% in a filterbank that sparsely samples between 125 GHz to 220 GHz using filters with a mean loaded quality factor of 19.6. Our results demonstrate that a filterbank with a high efficiency is achievable using directional filters, giving a clear route towards efficient integral field units.
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