Ultrafast dynamics in solids probed by femtosecond time-resolved broadband electronic sum frequency generation

Time-resolved sum frequency generation is an established tool to investigate the ultrafast vibrationaldynamics withsurface andinterface specificity, which can be extended to the regime of electronic transitions using a white light continuum as demonstrated previously by studies of liquidinterfaces. We expand this technique to the investigation ofsolid single crystal samples. In particular, we demonstrate the potential of electronic sum frequency generation by probing the non-equilibriumdynamics at excitonic resonances inZnO with a sensitivity as small as 0.6% and with atime resolution of 160 fs.

Source: Applied Physics Letters - November 16, 2016 Category: Physics Authors: Laura Foglia, Martin Wolf and Julia St ähler Source Type: research