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An ultrafast terahertz (THz) pulse coupled to the tunnel junction of a scanning tunnelling microscope (STM) is found to produce a subpicosecond rectified current pulse that can be detected by the STM electronics. We use these THz-induced current pulses to develop a new type of ultrafast STM and demonstrate its unprecedented simultaneous 2 nm spatial resolution and 500 fs temporal resolution under ambient laboratory conditions [1]. The terahertz-pulse-coupled STM (THz-STM) is used to image the ultrafast capture of photoexcited carriers into a single InAs nanodot to show its unique capabilities (Fig. 1).
© 2013 IEEE
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