Interference of co-propagating Rayleigh and Sezawa waves observed with micro-focused Brillouin light scattering spectroscopy

@article{Geilen2020InterferenceOC,
  title={Interference of co-propagating Rayleigh and Sezawa waves observed with micro-focused Brillouin light scattering spectroscopy},
  author={Moritz Geilen and Felix Kohl and Alexandra Nicoloiu and Alexandru M{\"u}ller and Burkard Hillebrands and Philipp Pirro},
  journal={arXiv: Applied Physics},
  year={2020}
}
We use micro-focussed Brillouin light scattering spectroscopy ($\mu$BLS) to investigate surface acoustic waves (SAWs) in a GaN layer on a Si substrate at GHz frequencies. Furthermore, we discuss the concept of $\mu$BLS for SAWs and show that the crucial parameters of SAW excitation and propagation can be measured. We investigate a broad range of excitation parameters and observe that Rayleigh and Sezawa waves are excited simultaneously at the same frequency. Spatially resolved measurements of… 
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