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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Meeting ID: 959 4361 5637