SuperSpec: development towards a full-scale filter bank
SuperSpec: development towards a full-scale filter bank
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SuperSpec：向全尺寸滤波器组发展
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发表时间：
2016
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通讯作者：
J. Zmuidzinas
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作者：
J. Wheeler;S. Hailey;E. Shirokoff;P. Barry;C. Bradford;S. Chapman;G. Che;J. Glenn;M. Hollister;A. Kovács;H. Leduc;P. Mauskopf;R. McGeehan;C. Mckenney;R. O’Brient;S. Padin;T. Reck;C. Ross;C. Shiu;C. Tucker;R. Williamson;J. Zmuidzinas
SuperSpec是一种用于亚毫米/毫米波光谱的新型片上光谱仪技术。SuperSpec在其他直接探测亚毫米光谱仪技术中脱颖而出，因为探测器沿着单个微波馈线耦合到一系列谐振滤波器，而不是使用色散光学。SuperSpec利用动态电感检测器（KIDs）来检测该滤波器组中的辐射。这种设计的小轮廓使SuperSpec成为生产用于层析成像或星系红移调查的多目标光谱仪的自然选择。我们最近制造了一个器件，它是一个完整的280通道滤波器组的50通道子集，它将覆盖R = 275时的190 - 310 GHz范围。通过对该设备数据的分析，我们了解了可能的设计修改，以实现高产本底受限的SuperSpec光谱仪。结果表明，该子集滤波器组可以扩展到一个完整的滤波器组，在读出空间中只有很少的碰撞，检测器的响应率变化小于20%。此外，这个和其他原型器件的特性表明，噪声性能受到产生重组噪声的限制。最后，我们发现探测器在R = 100时对地面光谱足够敏感，适合层析成像实验。需要进一步修改才能达到R = 400的背景限制，这对于单个星系的光谱学来说是理想的。
SuperSpec is a new spectrometer-on-a-chip technology for submm/mm-wave spectroscopy. SuperSpec stands out from other direct-detection submm spectrometer technologies in that the detectors are coupled to a series of resonant filters along a single microwave feedline instead of using dispersive optics. SuperSpec makes use of kinetic inductance detectors (KIDs) to detect radiation in this filter bank. The small profile of this design makes SuperSpec a natural choice to produce a multi-object spectrometer for tomographic mapping or galaxy redshift surveys. We have recently fabricated a device that is a 50 channel subset of a full 280 channel filter bank, which would cover the 190 - 310 GHz range at R = 275. Analysis of the data from this device informs us of the potential design modifications to enable a high-yield background-limited SuperSpec spectrometer. The results indicate that this subset filter bank can scale up to a full filter bank with only a few collisions in readout space and less than 20% variation in responsivity for the detectors. Additionally, the characterization of this and other prototype devices suggests that the noise performance is limited by generation-recombination noise. Finally, we find that the detectors are sufficiently sensitive for ground-based spectroscopy at R = 100, appropriate for tomographic mapping experiments. Further modifications are required to reach the background limit for R = 400, ideal for spectroscopy of individual galaxies.