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Hypersonic surface waves in 2D titanium nanostructure on silicon |
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| Authors: | Slawomir Mielcarek Aleksandra Trzaskowska Bartlomiej Graczykowski Jayanta Sarkar |
| Institution: | 1. Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61‐614 Poznań, Poland;2. Low Temperature Laboratory, Aalto University School of Science, P.O. Box 15100, 00076 AALTO, Finland |
| Abstract: | The non‐destructive method of Brillouin spectroscopy was applied to investigate the vibrations of 2D titanium nanoislands. Simulations realized by the Finite Element Method permitted determination of the dispersion relations of the surface waves propagating in the island structure and silicon substrate as well as the width of the frequency gap for the system studied. 3D maps of unit cell deformation for the structure with nanoislands for individual modes were obtained. The Brillouin experiment is shown as an excellent tool for direct experimental determination of the presence of eigenvibrations and the frequency gap in phononic structures in the GHz range.  |
| Keywords: | nanostructures surface phonons Brillouin spectroscopy phononic crystals |