Hypersonic surface waves in 2D titanium nanostructure on silicon

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 substr...

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Bibliographic Details
Published in:Physica status solidi. PSS-RRL. Rapid research letters 2012-04, Vol.6 (4), p.175-177
Main Authors: Mielcarek, Slawomir, Trzaskowska, Aleksandra, Graczykowski, Bartlomiej, Sarkar, Jayanta
Format: Article
Language:English
Subjects:
Brillouin spectroscopy
Cells
Deformation
Nanostructured materials
nanostructures
phononic crystals
Silicon
surface phonons
Titanium
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Summary: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. Exemplary 3D map of unit cell deformation for the structure with titanium nanoislands of 150 nm. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) This Letter presents experimental and theoretical evidence for a phononic frequency gap in the hypersonic range for thermally activated surface acoustic waves. Two‐dimensional phononic crystals have been studied by surface Brillouin light scattering. The spectra have revealed the presence of a new type of surface modes, which are related to phononic effects and mechanical eigenmodes of nanoislands. The experimental data were compared with results of theoretical modelling performed by the finite element method.
ISSN:1862-6254
1862-6270
DOI:10.1002/pssr.201206039