A 1.3-THz Balanced Waveguide HEB Mixer for the APEX Telescope
A 1.3-THz Balanced Waveguide HEB Mixer for the APEX Telescope
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DOI：
10.1109/tmtt.2008.2008946
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发表时间：
2009
影响因子：
4.3
通讯作者：
D. Meledin;A. Pavolotsky;V. Desmaris;I. Lapkin;C. Risacher;V. Perez;D. Henke;O. Nystrom;E. Sundi
中科院分区：
文献类型：
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作者：
D. Meledin;A. Pavolotsky;V. Desmaris;I. Lapkin;C. Risacher;V. Perez;D. Henke;O. Nystrom;E. Sundi
在本文中，我们报告了用于阿塔卡马探路者实验望远镜的平衡波导热电子辐射热计 (HEB) 接收器的开发、制造和表征，覆盖 1.25-1.39 THz 频段。该接收器采用正交平衡方案和两个 HEB 混频器，由沉积在晶体石英基板上的 4 至 5 nm 厚的 NbN 薄膜制成，中间有 MgO 缓冲层。我们采用了一种新颖的微加工方法来生产亚微米精度的全金属波导部件（主模波导尺寸为 90 乘以 180 μm）。我们提供有关混频器设计和测量结果的详细信息，包括接收器噪声性能、稳定性和望远镜现场的“第一光”。该接收器在射频频段上产生的双边带噪声温度平均值低于 1200 K，并且具有出色的稳定性，光谱阿伦时间超过 200 秒。
In this paper, we report about the development, fabrication, and characterization of a balanced waveguide hot electron bolometer (HEB) receiver for the Atacama Pathfinder EXperiment telescope covering the frequency band of 1.25-1.39 THz. The receiver uses a quadrature balanced scheme and two HEB mixers, fabricated from 4- to 5-nm-thick NbN film deposited on crystalline quartz substrate with an MgO buffer layer in between. We employed a novel micromachining method to produce all-metal waveguide parts at submicrometer accuracy (the main-mode waveguide dimensions are 90 times 180 mum ). We present details on the mixer design and measurement results, including receiver noise performance, stability and ldquofirst-lightrdquo at the telescope site. The receiver yields a double-sideband noise temperature averaged over the RF band below 1200 K, and outstanding stability with a spectroscopic Allan time more than 200 s.