2023/09/05 by Danny Fainozzi, Sara Catalini, Fainozzi, Danny +7
Engineering · Physics and Astronomy · #78 #80 #FOS: Physical sciences #Mechanical and Optical Resonators #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Photonic and Optical Devices #Photorefractive and Nonlinear Optics
paper · pdf · doi:10.48550/arxiv.2309.02308
openalex publication_date 2023/09/05 · openalex created_date 2023/09/09 · openalex updated_date 2026/07/28
We used optical laser pulses to create transient gratings (TGs) with sub-10 μm spatial periodicity in a Bismuth Germanate (310) (Bi4Ge3O12) single crystal at room temperature. The TG launches phonon modes, whose dynamics were revealed via forward diffraction of a third, time-delayed, heterodyne-detected optical pulse. Acoustic oscillations have been clearly identified in a time-frequency window not covered by previous spectroscopic studies and their characteristic dynamic parameters have been measured as a function of transferred momenta magnitude and direction.