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22 March 2021 Diffraction-free propagation of acoustic bean through solid-fluid periodic lattice
Arkadii Krokhin, Yurii Zubov, Bahram Djafari-Rouhani, Yuqi Jin, Mathew Sofield, Ezekiel Walker, Tae-Youl Choi, Arup Neogi
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Proceedings Volume 11593, Health Monitoring of Structural and Biological Systems XV; 115931L (2021) https://doi.org/10.1117/12.2581643
Event: SPIE Smart Structures + Nondestructive Evaluation, 2021, Online Only
Abstract
We propose a simple solid-fluid layered structure where narrow Gaussian acoustic beam propagates practically without spreading. It is demonstrated that the coefficient (so-called diffraction coefficient), which defines the rate of linear spreading, vanishes if a certain relation between frequency and direction of propagation is hold. Unlike nonspreading “light bullets” recently proposed in optics, acoustic monochromatic signal can propagate in diffraction-free regime without sophisticated modulation. In the experiment with steel-water layered structure we observe nonspreading propagation of a signal with frequency ~ 100 kHz at a distance ~ 1m. Such long-range collimation is accompanied by negative phase velocity refraction, anomalous dispersion, and very strong anisotropy of the effective mass density. Such long-range collimation is accompanied by negative phase velocity refraction, anomalous dispersion, and very strong anisotropy of the effective mass density.
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Arkadii Krokhin, Yurii Zubov, Bahram Djafari-Rouhani, Yuqi Jin, Mathew Sofield, Ezekiel Walker, Tae-Youl Choi, and Arup Neogi "Diffraction-free propagation of acoustic bean through solid-fluid periodic lattice", Proc. SPIE 11593, Health Monitoring of Structural and Biological Systems XV, 115931L (22 March 2021); https://doi.org/10.1117/12.2581643
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KEYWORDS
Wave propagation
Acoustics
Dispersion
Anisotropy
Beam propagation method
Diffraction
Gaussian beams
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