2024/09/08 by Ondřej Wojewoda, Wojewoda, Ondřej, Martin Hrtoň +3 · 3 citations
Engineering · Physics and Astronomy · #Advanced Optical Sensing Technologies #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Optics (physics.optics) #Photoacoustic and Ultrasonic Imaging
paper · pdf · doi:10.48550/arxiv.2409.05141
openalex publication_date 2024/09/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Although micro-focused Brillouin light scattering (BLS) has been used for more than twenty years, it lacks a complete theoretical description. This complicates the analysis of experimental data and significantly limits the information that can be obtained. To fill this knowledge gap, we have developed a semi-analytical model based on the mesoscopic continuous medium approach. The model consists of the following steps: calculation of the incident electric field and the dynamic susceptibility, calculation of the induced polarisation, and calculation of the emitted electric field and its propagation towards the detector. We demonstrate the model on the examples of the measurements of thermal and coherently excited spin waves. However, the used approach is general and can describe any micro-focused Brillouin light scattering experiment. The model can also bring new analytical approaches to mechanobiology experiments or to characterization of acoustic wave based devices.