Open AccessBrillouin scattering-like effect and non-reciprocal propagation of elastic waves due to spatio-temporal modulation of electrical boundary conditions in piezoelectric media
Author(s) -
Charles Croënne,
J. O. Vasseur,
O. Bou Matar,
Marie-Fraise Ponge,
Pierre A. Deymier,
Anne-Christine Hladky,
Bertrand Dubus
Publication year - 2017
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.4975680
Subject(s) - brillouin zone , modulation (music) , brillouin scattering , piezoelectricity , condensed matter physics , materials science , scattering , wave propagation , optics , acoustic wave , harmonic , physics , acoustics , optical fiber
The properties of a one-dimensional phononic crystal made of identical piezoelectric elements separated by thin metallic electrodes connected to the ground are studied theoretically for cases where the locations of the electrical connections change as a function of time with a specific speed. This spatio-temporal modulation of the electrical boundary conditions results in significant non-linear effects that are evidenced numerically. The interaction between an incident harmonic longitudinal wave and the time-dependent phononic crystal is shown to lead to frequency splitting analogous to Brillouin scattering. Moreover, the boundaries of the Bragg bandgaps are strongly affected, and for some specific modulation speed, one-way wave propagation can be achieved. Published by AIP Publishing
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