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Terahertz near-field microscopy using the self-mixing effect in a quantum cascade laser

机译:太赫兹近场显微镜,在量子级联激光器中使用自混合效应

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We demonstrate terahertz (THz) apertureless near-field microscopy exploiting the self-mixing effect in a quantum cascade laser (QCL). A THz wave is scattered by a sharp needle positioned above an object and coupled back into the QCL cavity resulting in detection of the THz near-field signal through the self-mixing effect. Using this technique we demonstrate two-dimensional imaging at 2.53 THz with a spatial resolution of 1 μm - the highest image resolution achieved with a THz frequency QCL to date. This method offers an experimentally simple approach to coherent, high-resolution THz imaging.
机译:我们展示了利用量子级联激光器(QCL)中的自混合效应的太赫兹(THz)无孔近场显微镜。太赫兹波被位于对象上方的尖锐针头散射,然后耦合回到QCL腔中,从而通过自混合效应检测到太赫兹近场信号。使用此技术,我们演示了在2.53 THz处的二维成像,其空间分辨率为1μm-迄今为止使用THz频率QCL实现的最高图像分辨率。这种方法为相干,高分辨率THz成像提供了一种实验简单的方法。

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