Fast terahertz detectors with spectral tunability based on quantum Hall Corbino devices
Fast terahertz detectors with spectral tunability based on quantum Hall Corbino devices
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基于量子霍尔 Corbino 器件的具有光谱可调性的快速太赫兹探测器
DOI：
10.1063/1.2061863
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发表时间：
2005
影响因子：
4
通讯作者：
G. Hein
中科院分区：
文献类型：
--
作者：
C. Stellmach;A. Hirsch;G. Nachtwei;Y. Vasilyev;N. G. Kalugin;G. Hein
我们提出了 Corbino 形 GaAs∕AlGaAs 异质结构的太赫兹光电导测量。太赫兹源是脉冲 p-Ge 激光器，可提供 1.7THz 至 2.5THz 的光子频率（对应于 180-120μm 的波长）。我们研究了从耗散态到量子霍尔态时间分辨的弛豫过程，发现弛豫时间取决于所施加的电压和样品的迁移率。观察到约 10ns 至超过 200ns 的弛豫时间。建议用一张简单的图片来解释结果。此外，还讨论了光谱分辨测量。短响应时间、有用的光谱选择性以及高灵敏度使得 QH 器件有望成为高性能太赫兹探测器。我们提出了 Corbino 形 GaAs∕AlGaAs 异质结构的太赫兹光电导测量。太赫兹源是脉冲 p-Ge 激光器，可提供 1.7THz 至 2.5THz 的光子频率（对应于 180-120μm 的波长）。我们研究了从耗散态到量子霍尔态时间分辨的弛豫过程，发现弛豫时间取决于所施加的电压和样品的迁移率。观察到约 10ns 至超过 200ns 的弛豫时间。建议用一张简单的图片来解释结果。此外，还讨论了光谱分辨测量。响应时间短、有用的光谱选择性以及高灵敏度使得 QH 器件有望成为高性能太赫兹探测器。
We present THz photoconductivity measurements on Corbino-shaped GaAs∕AlGaAs heterostructures. The THz source is a pulsed p-Ge laser, which provides photon frequencies of 1.7THzto2.5THz (corresponding to wavelengths of 180–120μm). We investigate the relaxation process from the dissipative state to the quantum Hall state time-resolved and find that the relaxation time depends on the applied voltage and on the mobility of the sample. Relaxation times of approximately 10ns to over 200ns are observed. A simple picture is suggested to explain the results. In addition, spectrally resolved measurements are discussed. The short response time and the useful spectral selectivity together with the high sensitivity make QH devices promising for high-performance THz detectors.We present THz photoconductivity measurements on Corbino-shaped GaAs∕AlGaAs heterostructures. The THz source is a pulsed p-Ge laser, which provides photon frequencies of 1.7THzto2.5THz (corresponding to wavelengths of 180–120μm). We investigate the relaxation process from the dissipative state to the quantum Hall state time-resolved and find that the relaxation time depends on the applied voltage and on the mobility of the sample. Relaxation times of approximately 10ns to over 200ns are observed. A simple picture is suggested to explain the results. In addition, spectrally resolved measurements are discussed. The short response time and the useful spectral selectivity together with the high sensitivity make QH devices promising for high-performance THz detectors.
高灵敏度量子霍尔远红外光电探测器的性能
DOI：
--
发表时间：
2002
期刊：
Applied Physics Letters 80
影响因子：
--
作者：
Astafier;S.Kamiyama;Y.Kawano;Y.Kawaguchi
通讯作者：
Y.Kawaguchi