Propagation study of Rayleigh surface acoustic wave in a one-dimensional piezoelectric phononic crystal covered with two homogeneous layers
| Autor: | Mohamed Hédi Ben Ghozlen, Hassiba Ketata, Mohamed Mkaoir |
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| Rok vydání: | 2018 |
| Předmět: |
Electromechanical coupling coefficient
Materials science Condensed matter physics business.industry Band gap Surface acoustic wave 02 engineering and technology Acoustic wave 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Condensed Matter::Materials Science symbols.namesake Optics Dispersion relation 0103 physical sciences symbols Plane wave expansion General Materials Science Electrical and Electronic Engineering Rayleigh scattering Phase velocity 010306 general physics 0210 nano-technology business |
| Zdroj: | Superlattices and Microstructures. 113:379-393 |
| ISSN: | 0749-6036 |
| Popis: | In this paper, plane wave expansion and stiffness matrix methods are adopted to analyze the dispersion relation of Rayleigh surface acoustic waves in a piezoelectric phononic composite composed of two homogeneous layers (ZnO and AlN) deposited on a one-dimensional piezoelectric (111) Si/AlN phononic substrate. The effect of crystallographic orientation of silicon on the dispersion relation is discussed. We found that the width of the gap became larger when the middle layer was introduced. The influence of filling fraction, thicknesses of the film and the middle layer on the band gap width is discussed. In addition, the phase velocity and the electromechanical coupling coefficient for Rayleigh surface modes are calculated versus the filling fraction. A comparison of phononic composite with ZnO/AlN/(111)Si layered structure is presented to deduce the interest of introduction of the phononic substrate. |
| Databáze: | OpenAIRE |
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