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We report on apertureless terahertz (THz) microscopy and its application for semiconductor characterization. Extreme subwavelength resolutions down to 150nm are achieved with few-cycle THz pulses having a bandwidth of 3THz. The imaging mechanism is characterize by time-resolved THz techniques. We find that apertureless THz microscopy can be well described by the electronic resonance of the scanning-tip...
We study terahertz emission due to charge transport in inhomogeneous fields of semiconductor devices. The dependence on the applied field unveils individual constituents such as intervalley transfer of electrons and the contribution of hole transport.
We study terahertz emission due to charge transport in inhomogeneous fields of semiconductor devices. The dependence on the applied field unveils individual constituents such as intervalley transfer of electrons and the contribution of hole transport.
We present a novel terahertz technique for detecting concealed objects by sensing their individual acoustic phase lags when they perform a minute oscillation. The technique is sensitive to virtually all materials.
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