Picosecond Cathodoluminescence

Michele Merano,
LOA-ENSTA in Palaiseau, France

Abstract: We have developed an original time resolved cathodoluminescence set up. Electron pulses are produced by a laser driven picosecond electron gun that replaces the thermionic electron gun of a scanning electron microscope. The secondary electron and the cathodoluminescence imaging mode, joined with time resolved spectroscopic detection, lead insight into phenomena like transport, carrier capture and carrier recombination in a single nanostructure. This set up achieves remarkable combined spatial (50 nm) and temporal resolutions (12 ps). The carrier dynamics within GaAs based pyramidal nanostructures is reported.