Optical Characterization of OMT-Coupled TES Bolometers for LiteBIRD
Optical Characterization of OMT-Coupled TES Bolometers for LiteBIRD
复制标题
LiteBIRD 的 OMT 耦合 TES 辐射热测量计的光学表征
DOI：
10.1007/s10909-022-02808-7
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发表时间：
2022
影响因子：
2
通讯作者：
Shiraishi M. et al.
中科院分区：
文献类型：
--
作者：
LiteBIRD Collaboration: Hubmayr J.;Ade P. A. R.;Adler A.;...;Shiraishi M. et al.
馈源喇叭和正交模换能器（OMT）耦合过渡边缘传感器（TES）测辐射热计的设计和微制造，以满足光学规格的LiteBIRD高频望远镜（HFT）焦平面。我们讨论了两种LiteBIRD HFT探测器类型的设计和光学特性：双偏振，双频带像素与195/280 GHz和235/337 GHz频带中心。结果表明，良好匹配的通带之间的正交极化通道和频率中心的3%的设计值。每个频率通道的光效率保守地报告为在0.640.72的范围内，由对低温、温度控制的热源的响应确定。这些值与预期非常一致，超过或在LiteBIRD敏感性预测中使用的值的10%以内。最后，我们报告了在100 mK和200-350 GHz的频率范围内，这是以前在文献中报道的值相比，在Nb/SiN/Nb微带损耗的测量。
Feedhorn- and orthomode transducer- (OMT) coupled transition edge sensor (TES) bolometers have been designed and micro-fabricated to meet the optical specifications of the LiteBIRD high frequency telescope (HFT) focal plane. We discuss the design and optical characterization of two LiteBIRD HFT detector types: dual-polarization, dual-frequency-band pixels with 195/280 GHz and 235/337 GHz band centers. Results show well-matched passbands between orthogonal polarization channels and frequency centers within 3% of the design values. The optical efficiency of each frequency channel is conservatively reported to be within the range 0.640.72, determined from the response to a cryogenic, temperature-controlled thermal source. These values are in good agreement with expectations and either exceed or are within 10% of the values used in the LiteBIRD sensitivity forecast. Lastly, we report a measurement of loss in Nb/SiN/Nb microstrip at 100 mK and over the frequency range 200–350 GHz, which is comparable to values previously reported in the literature.