Abstract
This study is devoted to experimentally achieving the phenomenon of periodic modulation of the acoustic-wave intensity, which is observed upon passage of an acoustic signal through a quasi-periodic structure and is the acoustic analog of the effect of Bloch oscillations (BO). Ultrasound at a frequency of 1 MHz is used, and a layered structure that consists of alternate plane-parallel glass and water layers serves as a super-lattice. In order to create an analog of the external electric field, the thickness of the water layers was changed inversely with respect to their ordinals. It is shown that the transmission spectrum of such a structure has the form of narrow equidistant peaks (an analog of the Wannier-Stark ladder), and the envelope of a transmitted signal undergoes periodic oscillations (analogous to BO). The experimental results are in good agreement with theoretical calculations performed by the transfer-matrix method.
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Original Russian Text © A.A. Karabutov, Jr., Yu.A. Kosevich, O.A. Sapozhnikov, 2013, published in Akusticheskii Zhurnal, 2013, Vol. 59, No. 2, pp. 158–169.
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Karabutov, A.A., Kosevich, Y.A. & Sapozhnikov, O.A. Bloch oscillations of an acoustic field in a layered structure. Acoust. Phys. 59, 137–147 (2013). https://doi.org/10.1134/S1063771013020061
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DOI: https://doi.org/10.1134/S1063771013020061