Regensburg 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
DS: Fachverband Dünne Schichten
DS 13: Poster
DS 13.59: Poster
Donnerstag, 20. März 2025, 18:00–20:00, P1
Coherent Control of Optical Phonon Modes in Bi Thin Films Using Polarization and Double-Pulse Excitation — •Timo Veslin1, Felix Hoff1, Jonathan Frank1, Felix Nöhl1, Abdur Rehman Jalil3, and Matthias Wuttig1,2,3 — 1I. Institute of Physics (IA), RWTH Aachen University, Germany — 2Jülich-Aachen Research Alliance (JARA FIT and JARA HPC) — 3Peter Grünberg Institute - JARA-Institute Energy Efficient Information Technology (PGI-10), Jülich, Germany
A new approach in the coherent control of optical phonon modes has been explored, enabling advances in material manipulation. By integrating polarization control with temporal modulation of double-pulse excitation, we show the selective and independent modulation of A1g and Eg phonon modes in a 12.5 nm bismuth thin film using a femtosecond pump-probe setup. This method takes advantage of the unique polarization dependencies of each phonon mode and quantum interference effects resulting from varying time delays between two pump pulses. The proposed approach is widely applicable to various materials and offers an unique level of active control over optical phonon excitation. This advancement could be relevant for emerging phononic technologies, such as nanoscale heat management, phononic data processing, and telecommunications. These applications are particularly vital for addressing the "THz gap" in the 1-10 THz spectral range, marking a crucial progress for the next generation of high-speed information transfer.
Keywords: Pump Probe; Bismuth Thin Film; Coherent Phonons; Femtosecond Laser; Coherent Control