Visualization of photocurrents in nanoobjects by ultrafast low-energy electron point-projection imaging

Abstract

Ultrafast photocurrents in pin-type semiconductor InP nanowires are investigated with femtosecond time and nanometer spatial resolution. We demonstrate the capability of femtosecond point-projection imaging as a novel tool for spatiotemporal mapping of transient fields at nanostructure surfaces using lowenergy electron pulses generated from a metal nanotip as a highly sensitive probe.