Detector architecture of the cosmology large angular scale surveyor
Detector architecture of the cosmology large angular scale surveyor
复制标题
宇宙学大角度尺度测量仪的探测器架构
DOI：
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发表时间：
2012
期刊：
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通讯作者：
L. Zeng
中科院分区：
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作者：
K. Rostem;C. Bennett;D. Chuss;N. Costen;E. Crowe;K. Denis;J. Eimer;N. Lourie;T. Essinger;T. Marriage;S. Moseley;T. Stevenson;D. Towner;G. Voellmer;Edward J. Wollack;L. Zeng
宇宙微波背景辐射（CMB）为检验现代宇宙学提供了强有力的工具。特别是，如果暴胀发生了，相关的引力波会在CMB上留下特定的极化图案。测量这种微弱的偏振信号需要大量的偏振敏感的、背景有限的探测器阵列，以及对与仪器设计相关的系统效应的前所未有的控制。为此，基于地面的宇宙学大角尺度测量仪（CLASS）采用在40、90和150 GHz频带下操作的大格式、喇叭天线耦合、背景限制的过渡边缘传感器（TES）测辐射热计阵列。检测器架构具有若干使能技术。采用片上对称平面正交模换能器（OMT），该换能器允许在宽带宽上的高度对称波束和低交叉极化。此外，OMT的四分之一波长反向短路是在芯片级使用创新的铟凸点键合工艺集成的，可确保整个阵列的最小损耗、最大可重复性和性能均匀性。已经注意减少杂散光和片上泄漏。在本文中，我们报告的第一个原型探测器的40 GHz焦平面的架构和性能。
The cosmic microwave background (CMB) provides a powerful tool for testing modern cosmology. In particular, if inflation has occurred, the associated gravitational waves would have imprinted a specific polarized pattern on the CMB. Measurement of this faint polarized signature requires large arrays of polarization-sensitive, background- limited detectors, and an unprecedented control over systematic effects associated with instrument design. To this end, the ground-based Cosmology Large Angular Scale Surveyor (CLASS) employs large-format, feedhorn- coupled, background-limited Transition-Edge Sensor (TES) bolometer arrays operating at 40, 90, and 150 GHz bands. The detector architecture has several enabling technologies. An on-chip symmetric planar orthomode transducer (OMT) is employed that allows for highly symmetric beams and low cross-polarization over a wide bandwidth. Furthermore, the quarter-wave backshort of the OMT is integrated using an innovative indium bump bonding process at the chip level that ensures minimum loss, maximum repeatability and performance uniformity across an array. Care has been taken to reduce stray light and on-chip leakage. In this paper, we report on the architecture and performance of the first prototype detectors for the 40 GHz focal plane.