Plate wave acoustic convoluter in CdS plates

Luukkala, M.; Ostrovski, I.

doi:10.1002/pssa.2210210250

Cited by 1 publication

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“…If piezoactive Lamb waves in C e r crystal plates propogate along the hexagonal axis C, ( z axis) and have elastic displacements along z and z axis, the ac conductivity 0, and the piezoelectric field El are given by formulas similar to (8). I n this case, however, the values of 1) and z are more complicated than those for shear waves.…”

Section: )mentioning

confidence: 99%

Second harmonic of the acoustoelectric current in piezosemiconductors

Ostrovski¹,

Bulakh²

1980

Phys. Stat. Sol. (a)

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The second harmonic of the acoustoelectric current generation J(2ω) as a consequence of electronic concentration nonlinearity during the propagation of elastic waves at frequency ω in piezosemiconductors is investigated both, theoretically and experimentally. Bulk waves and waves in the acoustic waveguides are considered. It is shown that the current J is directly proportional to the power and electronic attenuation of the ultrasound and to the drift mobility of carriers. In the acoustic waveguides the current J is subjected to a strong dispersion and tends to zero while ω tends to the cut‐off frequency of the mode. Under small electronic attenuation J ∼ sin kL/kL (where k is a wave number, L the length of electron‐phonon interaction) for all types of waves discussed, i.e. the so‐called “size effect” takes place. From the measuring period Δω of the function J(kL) the wave phase velocity may be determined. Results of the experiments carried out on shear bulk waves and waves in thin plates of CdS show good agreement with theoretical calculations.

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Section: )mentioning

confidence: 99%