Abstract
Using a two-color ultrafast optical pump-probe technique with an amplified Ti:sapphire femtosecond laser system, we study the heat-induced structural dynamics in gold by monitoring both the fundamental and third harmonic generation (THG) signals of the probe beam. An amplitude oscillation, with a period of tens of picoseconds, is clearly observed in the THG signal, but absent in fundamental. In contrast to previous understandings from a purely mechanical deformation point of view, we demonstrate that this oscillation in THG directly results from a periodic modulation of the Fermi level in gold driven by acoustic-phonon excitation following ultrafast laser heating.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
