Ultrafast graphene-based broadband THz detector
Ultrafast graphene-based broadband THz detector
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DOI：
10.1063/1.4813621
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发表时间：
2013-07-08
影响因子：
4
通讯作者：
Helm, Manfred
中科院分区：
文献类型：
--
作者：
Mittendorff, Martin;Winnerl, Stephan;Helm, Manfred
我们提出了一种超快石墨烯基探测器，在太赫兹范围内，在室温下工作。一个介电周期天线耦合到石墨烯片，这是通过剥离SiO2。该检测器的特点是与自由电子激光FELBE的波长从8 μ m到220 μ m。在30 ~ 220 μ m波长范围内，探测器的上升时间为50 ps。利用高强度下的非线性光电流响应的自相关测量揭示了低于10 ps的固有响应时间。该检测器具有很高的潜力，用于表征时间重叠，例如。例如，在一个实施例中，在双色泵浦探测实验中。(C)2013 AIP Publishing LLC.
We present an ultrafast graphene-based detector, working in the THz range at room temperature. A logarithmic-periodic antenna is coupled to a graphene flake that is produced by exfoliation on SiO2. The detector was characterized with the free-electron laser FELBE for wavelengths from 8 mu m to 220 mu m. The detector rise time is 50 ps in the wavelength range from 30 mu m to 220 mu m. Autocorrelation measurements exploiting the nonlinear photocurrent response at high intensities reveal an intrinsic response time below 10 ps. This detector has a high potential for characterizing temporal overlaps, e. g., in two-color pump-probe experiments. (C) 2013 AIP Publishing LLC.