Second-Harmonic Phonon Spectroscopy Using an Infrared Free-Electron Laser
- PC Online Talk
- Date: Nov 19, 2020
- Time: 11:00 AM (Local Time Germany)
- Speaker: Christopher Winta
- FHI Department PC

Making
use of the FHI free-electron laser (FEL), this work explores the
potential of IR second-harmonic generation (SHG) as a symmetry-sensitive
phonon spectroscopy. To this end, a comprehensive IR SHG study of the
model system α-quartz is performed, presenting the technique as a highly
sensitive tool to study optical phonons as well as symmetry changes
upon structural phase transitions in noncentrosymmetric polar crystals.
Second-harmonic
phonon spectroscopy is then employed for the study of functional
material systems. Specifically, atomic-scale semiconductor superlattices
and multiferroic thin films are investigated , showcasing the
technique's unique capabilities and limitations. Finally, perspectives
on how to further develop FEL-based nonlinear optical approaches are
presented.
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