Terahertz imaging using photomixers based on quantum well photodetectors

Terahertz imaging using photomixers based on quantum well photodetectors
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使用基于量子阱光电探测器的光混合器进行太赫兹成像

DOI:
10.1063/1.4993634
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发表时间:
2017-10
期刊:
影响因子:
1.6
通讯作者:
J. C. Cao
J. C. Cao
中科院分区:
材料科学4区
文献类型:
--
作者:
T. Zhou;Hua Li;W. J. Wan;Z. L. Fu;J. C. Cao

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太赫兹量子阱光电探测器(QWP)由于子带间跃迁快,要求工作速度快。最近,已经证明THz量子阱可以检测6.2GHz调制的THz光,因此它可以用作光混合器[H. Li等人,Sci. 7,3452(2017)]。在这项工作中,作者报告了一种新的主动太赫兹成像使用太赫兹QWP光混频器。用于该成像应用的THz辐射源是以连续波模式操作的多模THz量子级联激光器(QCL)。当快THz量子阱被多模THz辐射照射时,可以从量子阱梅萨中提取由QCL的相邻THz模式之间的频率拍频产生的中频信号用于成像应用。采用该技术,频率可以从太赫兹范围下变频到微波范围。因此,可以使用成熟的微波技术对信号进行放大、滤波和检测。
Due to the fast intersubband transitions, the terahertz (THz) quantum well photodetector (QWP) is supposed to work fast. Recently it has been demonstrated that the THz QWP can detect the THz light modulated at 6.2 GHz and therefore it can be used as a photomixer [H. Li et al., Sci. Rep. 7, 3452 (2017)]. In this work, the authors report a novel active THz imaging using THz QWP photomixers. The THz radiation source used for this imaging application is a multi-mode THz quantum cascade laser (QCL) operating in continuous wave mode. When the fast THz QWP is illuminated by the multi-mode THz radiation, the intermediate frequency signal that is resulted from the frequency beating between the neighbouring THz modes of the QCL can be extracted from the QWP mesa for imaging applications. Employing the technique, the frequency can be down-converted from the THz range to the microwave regime. And therefore, the signal can then be amplified, filtered, and detected using the mature microwave technology.
通过太赫兹光​​谱的理论模拟直接洞察CL-20/TNT高能共晶的分子间和分子内相互作用
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