Peculiarities of radio-frequency polarization echoes in piezoelectric powders

T. Ya. Asadullin; Ya. Ya. Asadullin; Vitaly V. Samartsev

doi:10.1117/12.287662

26 September 1997 Peculiarities of radio-frequency polarization echoes in piezoelectric powders

T. Ya. Asadullin, Ya. Ya. Asadullin, Vitaly V. Samartsev

Proceedings Volume 3239, Photon Echo and Coherent Spectroscopy; (1997) https://doi.org/10.1117/12.287662
Event: PECS '97: Photon Echo and Coherent Spectroscopy, 1997, Yoshkar-Ola, Russian Federation

Abstract

A theoretical description is given for such interesting properties of radiofrequency (rf) polarization echoes in piezoelectric powders as the existence of dynamic echoes and memory echoes, the integration effect when successive coherent pulse pairs are applied to the sample. These and other important properties of the echoes are explained from one and the same point of view by the use of nonlinear formation mechanisms based on the interaction of acoustic vibrations with the dislocations which are effective in the rf frequency domain. A phenomenological model is elaborated for dynamics of dislocations in mechanically vibrating piezoelectric particles resonantly excited by short duration pulses of rf electric field. The model includes both the reversible and irreversible moving groups of dislocations generated by Frank-Read sources. The amplitude-dependent dispersion and amplitude-dependent damping obtained by use of this model constitute two of the three nonlinear mechanisms responsible for the formation of the polarization echoes in piezoelectric powders with the signals naturally consisting of both the dynamic and the memory components. The third type of the nonlinearities, the field-mode interaction, consists of the electrostriction due to the irreversible motion of charged dislocations and the nonlinear electrostriction.

Citation Download Citation

T. Ya. Asadullin, Ya. Ya. Asadullin, and Vitaly V. Samartsev "Peculiarities of radio-frequency polarization echoes in piezoelectric powders", Proc. SPIE 3239, Photon Echo and Coherent Spectroscopy, (26 September 1997); https://doi.org/10.1117/12.287662

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