Wideband on-chip terahertz spectrometer based on a superconducting filterbank
Wideband on-chip terahertz spectrometer based on a superconducting filterbank
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DOI：
10.1117/1.jatis.5.3.035004
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发表时间：
2019-07-01
影响因子：
2.3
通讯作者：
Baselmans, Jochem J. A.
中科院分区：
文献类型：
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作者：
Endo, Akira;Karatsu, Kenichi;Baselmans, Jochem J. A.
太赫兹光谱仪具有广泛的瞬时频率覆盖范围，用于被动遥感，对于许多太赫兹应用，如天文学，大气科学和安全，具有巨大的吸引力。在这里，我们展示了一个宽带太赫兹光谱仪的基础上，一个单一的超导芯片。该芯片由一个耦合到传输线滤波器组的天线组成，每个滤波器后面有一个微波动态电感检测器。使用频分复用，所有探测器同时读出，创建一个宽带光谱仪，瞬时带宽为45 GHz，中心约为350 GHz。光谱仪的光谱分辨率为F/Δ F = 380，达到光子噪声限制的灵敏度。我们讨论了芯片的设计和制作，以及系统集成和测试。我们通过检测甲醇气体的发射线光谱来确认整个系统的运行。所提出的概念允许在大带宽和高达F/Δ F类似于1000的分辨率上进行光谱辐射检测，所有这些都使用几cm（2）的芯片面积。这将允许以前所未有的速度和灵敏度构建中等分辨率成像光谱仪。(C)作者。由SPIE在知识共享署名4.0未移植许可下发布。
Terahertz spectrometers with a wide instantaneous frequency coverage for passive remote sensing are enormously attractive for many terahertz applications, such as astronomy, atmospheric science, and security. Here we demonstrate a wide-band terahertz spectrometer based on a single superconducting chip. The chip consists of an antenna coupled to a transmission line filterbank, with a microwave kinetic inductance detector behind each filter. Using frequency division multiplexing, all detectors are read-out simultaneously, creating a wide-band spectrometer with an instantaneous bandwidth of 45 GHz centered around 350 GHz. The spectrometer has a spectral resolution of F/Delta F = 380 and reaches photon-noise limited sensitivity. We discuss the chip design and fabrication, as well as the system integration and testing. We confirm full system operation by the detection of an emission line spectrum of methanol gas. The proposed concept allows for spectroscopic radiation detection over large bandwidths and resolutions up to F/Delta F similar to 1000, all using a chip area of a few cm(2). This will allow the construction of medium resolution imaging spectrometers with unprecedented speed and sensitivity. (C) The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License.