Finite-wavelength effect on the ballistic propagation of surface acoustic waves

Tamura, Shin–ichiro; Yagi, Masashi

doi:10.1103/physrevb.49.17378

Cited by 11 publications

(5 citation statements)

References 15 publications

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“…The wave field pattern obtained in the directions between 0°and 90°is complicated, because of the various effects of the anisotropy ͑phonon focusing, electromechanical coupling efficiency͒ of the cubic substrate. 22 As already mentioned, a Rayleigh wave is found in the 45°direction that shows no electromechanical coupling ͓Fig. 3͑d͒; true SAW ͑TSAW͔͒.…”

mentioning

confidence: 92%

High-resolution imaging of a single circular surface acoustic wave source: Effects of crystal anisotropy

Hesjedal

Behme

2001

Applied Physics Letters

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We present an experimental method for the high-resolution imaging of the excitation and propagation of surface acoustic waves (SAWs) on anisotropic piezoelectric substrates. By employing a scanning acoustic force microscope (SAFM), we are able to image acoustic waves that are excitable by a single circular electrode pair source through the mixing with well-defined reference plane waves. We show amplitude and phase images of the point-source wave field, containing the angular dependence of the phase velocity of these modes, as well as their electromechanical coupling strength. The SAFM allows easy access to acoustic material properties, which are important for the design of commercial SAW devices.

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confidence: 92%

High-resolution imaging of a single circular surface acoustic wave source: Effects of crystal anisotropy

Hesjedal

Behme

2001

Applied Physics Letters

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“…3͑a͒. 16 For water loading ͓Fig. 3͑c͔͒, the cusps do not exist in the group-velocity curves of the RSW, but they instead appear in the IRW branch ͑at 34.5°and 40.8°from the ͓100͔ and their equivalent directions͒.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…This would be interesting in conjunction with recent experimental verifications [7][8][9][10] of the predicted ''phonon focusing '' 11,12 at crystal surfaces. [13][14][15][16] One of the current methods used for studying the focusing effect of SAW's or surface phonons utilizes focused ultrasonic immersion transducers. 8,9 With this method, the propagation of SAW's with the effect of liquid in contact with an anisotropic solid surface has been measured.…”

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confidence: 99%

Effects of liquid loading on surface acoustic waves in solids

1996

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We study the effect of liquid loading on the characteristics of surface acoustic waves propagating along the ͑100͒ surface of silicon. A nonviscous liquid layer of infinite thickness in contact with a solid substrate causes changes in the wave velocity and the attenuation of surface waves along the liquid-solid boundary. More importantly, we examine an additional branch of the Rayleigh surface that is induced by the liquid loading. We also find that the pseudosurface wave, which is restricted only to certain directions on the free surface, extends to all directions on the liquid-loaded ͑100͒ surface. Calculating the acoustic Poynting vectors associated with these surface-related acoustic modes, we find that the Rayleigh wave and the induced Rayleigh wave emit energy only into the liquid, whereas the pseudosurface wave emits energy both into the liquid and solid substrate. ͓S0163-1829͑96͒03131-1͔

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“…They are related to some inhomogeneity occurring within a propagation process, having very diverse origins. For instance, in solid state physics, anisotropy is responsible for phonon focusing at the same time for volume and surface ultrasonic waves [1][2][3][4][5]. In fact, the phonon focusing effect is the consequence of the wave energy direction which is orthogonal to the phase slowness curves (i.e.…”

Section: Introduction and Position Of The Problemmentioning

confidence: 99%

Cuspidal caustic and focusing of acoustical waves generated by a parametric array onto a concave reflecting surface

Castagnède

Sahraoui

Tournat

et al. 2009

Comptes Rendus. Mécanique

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The present Note is devoted to the study of the so-called cuspidal caustic at the surface of a hemi-cylindrical reflector illuminated with plane waves. In order to generate low frequency (e.g. in the range of 4 kHz) acoustical plane waves, a commercially available parametric array has been used. It produces powerful ultrasonic carrier waves at 40 kHz which can be electronically modulated between 200 Hz and 10 kHz. Further self-demodulation process during propagation in air generates an ultra-directive acoustical field (i.e. quasi-planar wavefronts) enabling to accurately study the focusing process occurring along the cuspidal caustic. The focusing coefficient can be computed locally by using two numerical tools, on one hand by computing the density of tangent rays to the caustic, and on the other hand by using some numerical results provided by a ray tracing algorithm. Some preliminary experimental data are then provided in order to validate the numerical predictions (spatial position of the caustic and focusing coefficient).

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Finite-wavelength effect on the ballistic propagation of surface acoustic waves

Cited by 11 publications

References 15 publications

High-resolution imaging of a single circular surface acoustic wave source: Effects of crystal anisotropy

High-resolution imaging of a single circular surface acoustic wave source: Effects of crystal anisotropy

Effects of liquid loading on surface acoustic waves in solids

Cuspidal caustic and focusing of acoustical waves generated by a parametric array onto a concave reflecting surface

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