Surface Wave Propagation in Thin Silver Films under Residual Stress

2002 ◽  
Vol 57 (1-2) ◽  
pp. 58-64
Author(s):  
A. Njeh ◽  
D. Schneider ◽  
H. Fuess ◽  
M. H. Ben Ghozlen
Keyword(s):  
Residual Stresses ◽  
Phase Velocity ◽  
Surface Waves ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Dispersion Curves ◽  
Silver Films ◽  
Surface Wave Propagation ◽  
Relative Change ◽  
Good Agreement

Investigations using surface acoustic waves provide information on the elastic properties of thin films. Residual stresses change the phase velocity of the surface waves. We have calculated the phase velocity and dispersion of surface waves in thin silver films with a strong [111]-fibre texture. A non-linear description of surface waves propagating along the [110]-direction of the substrate has been developed on the basis of an acoustoelastic theory, taking into account residual stresses. The relative change Δc/c of the velocity v was found to be linear for large excitation frequencies. The dispersion curves were measured using a photoacoustic method. For sputtered polycrystalline thin silver films we found good agreement between the experimental and calculated dispersion curves for frequencies up to 225 MHz

Surface Wave Propagation in Thin Silver Films under Residual Stress

2002 ◽  
Vol 57 (9-10) ◽  
pp. 58-64
Author(s):  
A. Njeh ◽  
T. Wieder ◽  
D. Schneider ◽  
H. Fuess ◽  
M. H. Ben Ghozlen
Keyword(s):  
Residual Stresses ◽  
Phase Velocity ◽  
Surface Waves ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Dispersion Curves ◽  
Silver Films ◽  
Surface Wave Propagation ◽  
Relative Change ◽  
Good Agreement

Investigations using surface acoustic waves provide information on the elastic properties of thin films. Residual stresses change the phase velocity of the surface waves. We have calculated the phase velocity and dispersion of surface waves in thin silver films with a strong [111]-fibre texture. A non-linear description of surface waves propagating along the [110]-direction of the substrate has been developed on the basis of an acoustoelastic theory, taking into account residual stresses. The relative change Δv/v of the velocity v was found to be linear for large excitation frequencies. The dispersion curves were measured using a photoacoustic method. For sputtered polycrystalline thin silver films we found good agreement between the experimental and calculated dispersion curves for frequencies up to 225 MHz.

Visualization of inverse phase velocity surfaces of bulk and surface acoustic waves

1973 ◽  
Vol 45 (5) ◽  
pp. 357-358 ◽  
Author(s):  
W.S. Goruk ◽  
P.J. Vella ◽  
G.I.A. Stegeman
Keyword(s):  
Phase Velocity ◽  
Acoustic Waves ◽  
Surface Acoustic Waves

scholarly journals Streaming by leaky surface acoustic waves

2010 ◽  
Vol 467 (2130) ◽  
pp. 1779-1800 ◽  
Author(s):  
J. Vanneste ◽  
O. Bühler
Keyword(s):  
Surface Waves ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Acoustic Streaming ◽  
Stokes Drift ◽  
Mean Flow ◽  
Matched Asymptotics ◽  
Flow Generation ◽  
Solid Liquid Interface ◽  
Solid Liquid

Acoustic streaming, the generation of mean flow by dissipating acoustic waves, provides a promising method for flow pumping in microfluidic devices. In recent years, several groups have been experimenting with acoustic streaming induced by leaky surface waves: (Rayleigh) surface waves excited in a piezoelectric solid interact with a small volume of fluid where they generate acoustic waves and, as result of the viscous dissipation of these waves, a mean flow. We discuss the computation of the corresponding Lagrangian mean flow, which controls the trajectories of fluid particles and hence the mixing properties of the flows generated by this method. The problem is formulated using the averaged vorticity equation which extracts the dominant balance between wave dissipation and mean-flow dissipation. Particular attention is paid to the thin boundary layer that forms at the solid/liquid interface, where the flow is best computed using matched asymptotics. This leads to an explicit expression for a slip velocity, which includes the effect of the oscillations of the boundary. The Lagrangian mean flow is naturally separated into three contributions: an interior-driven Eulerian mean flow, a boundary-driven Eulerian mean flow and the Stokes drift. A scale analysis indicates that the latter two contributions can be neglected in devices much larger than the acoustic wavelength but need to be taken into account in smaller devices. A simple two-dimensional model of mean flow generation by surface acoustic waves is discussed as an illustration.

scholarly journals Evaluation of Effective Elastic Properties of Nitride NWs/Polymer Composite Materials Using Laser-Generated Surface Acoustic Waves

2018 ◽  
Vol 8 (11) ◽  
pp. 2319 ◽  
Author(s):  
Evgeny Glushkov ◽  
Natalia Glushkova ◽  
Bernard Bonello ◽  
Lu Lu ◽  
Eric Charron ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Composite Materials ◽  
Elastic Constants ◽  
Acoustic Waves ◽  
Composite Structures ◽  
Elastic Moduli ◽  
Surface Acoustic Waves ◽  
Dispersion Curves ◽  
Effective Elastic Moduli ◽  
Asymptotic Representations

In this paper we demonstrate a high potential of transient grating method to study the behavior of surface acoustic waves in nanowires-based composite structures. The investigation of dispersion curves is done by adjusting the calculated dispersion curves to the experimental results. The wave propagation is simulated using the explicit integral and asymptotic representations for laser-generated surface acoustic waves in layered anisotropic waveguides. The analysis of the behavior permits to determine all elastic constants and effective elastic moduli of constituent materials, which is important both for technological applications of these materials and for basic scientific studies of their physical properties.

Excitation of high frequency surface acoustic waves by phase velocity scanning of a laser interference fringe

1993 ◽  
Vol 62 (17) ◽  
pp. 2036-2038 ◽  
Author(s):  
Hideo Nishino ◽  
Yusuke Tsukahara ◽  
Yoshihiko Nagata ◽  
Toshio Koda ◽  
Kazushi Yamanaka
Keyword(s):  
Phase Velocity ◽  
Acoustic Waves ◽  
High Frequency ◽  
Interference Fringe ◽  
Surface Acoustic Waves ◽  
Laser Interference

scholarly journals Analytical Investigation of Surface Wave Characteristics of Piezoelectromagnetics of Class 6 mm

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Aleksey A. Zakharenko
Keyword(s):  
Surface Wave ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Transversely Isotropic ◽  
Analytical Investigation ◽  
Wave Characteristics ◽  
Surface Wave Propagation ◽  
Theoretical Investigations ◽  
Derivatives Of ◽  
Shear Horizontal

This short work copes with theoretical investigations of some surface wave characteristics for transversely isotropic piezoelectromagnetic composites of class 6 mm. In the composite materials, the surface Bleustein-Gulyaev-Melkumyan wave and some new shear-horizontal surface acoustic waves (SH-SAWs) recently discovered by the author can propagate. The phase velocities of the SH-SAWs can have complicated dependencies on the coefficient of the magnetoelectromechanical coupling (CMEMC) which depends on the electromagnetic constant of the composites. Therefore, the analytical finding of the first and second partial derivatives of the represents the main purpose of this study. It is thought that the results of this short letter can help for theoreticians and experimentalists working in the research arena of opto-acoustoelectronics to completely understand some problems of surface wave propagation in piezoelectromagnetics.

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