Nonlinear self-collimated sound beams in sonic crystals
Abstract
We report the propagation of high-intensity sound beams in a sonic crystal, under self-collimation or reduced-divergence conditions. The medium is a fluid with elastic quadratic nonlinearity, where the dominating nonlinear effect is harmonic generation. The conditions for the efficient generation of narrow, nondiverging beam of second harmonic are discussed. Numerical simulations are in agreement with the analytical predictions made, based on the linear dispersion characteristics in modulated media and the nonlinear interaction in a quadratic medium under phase matching conditions. ; The work was supported by Ministerio de Economia y Competitividad of the Spanish government, and the European Union FEDER through Projects No. FIS2011-29734-C02-01 and -02, and No. MTM2012-36740-C02-02. We acknowledge A. Cebrecos and V. Romero-Garcia for their help in the band structure calculations. E.M.H. acknowledges EU-EMMAG program for his postdoctoral fellowship. ; Hamham, EM.; Jimenez, N.; Picó Vila, R.; Sánchez Morcillo, VJ.; García-Raffi, LM.; Staliünas, K. (2015). Nonlinear self-collimated sound beams in sonic crystals. Physical Review B. 92(5). doi:10.1103/PhysRevB.92.054302 ; S ; 054302 ; 92 ; 5
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