Surface Brillouin scattering in Titanium Carbide films
| Autor: | Arthur G. Every, C. Sumanya, J. D. Comins |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Titanium carbide Materials science Condensed matter physics business.industry Applied Mathematics General Physics and Astronomy 02 engineering and technology Acoustic wave Substrate (electronics) 021001 nanoscience & nanotechnology 01 natural sciences Spectral line Stiffening Computational Mathematics chemistry.chemical_compound Amplitude Optics chemistry Brillouin scattering Modeling and Simulation 0103 physical sciences Wave vector 0210 nano-technology business |
| Zdroj: | Wave Motion. 68:78-87 |
| ISSN: | 0165-2125 |
| DOI: | 10.1016/j.wavemoti.2016.08.011 |
| Popis: | Simulations of surface Brillouin scattering (SBS) spectra of TiC hard films on several substrates have been carried out over a range of film thickness from 5 nm to 1000 nm. The simulations are based on the elastodynamic Green’s function method that predicts the surface displacement amplitudes of acoustic phonons. These simulations provide information essential to understand and analyse experimental data emerging from SBS experiments. A thorough discussion of all possible surface acoustic waves propagating in a TiC film deposited on a substrate is presented. There are striking differences in the simulated SBS spectra depending on the respective elastic properties of the film and the substrate. One can either have stiffening or loading system. This can further be categorised into strong and weak stiffening or loading systems. For the first time the weak stiffening system is presented. The velocity dispersion of the modes as a function of the product of surface wavevector and thickness ( q ∥ d ) has also been simulated, which allows the elastic constants of the films to be determined. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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