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Sonic crystals are media with a periodic modulation of the acoustic parameters, as the density and the bulk modulus. They have recently attracted a great interest, because of their potential applications in the control of sound propagation, used as reflectors, focusers or waveguides. All these properties are related with the dispersion introduced by the crystal anisotropy. We report on the nondiffractive propagation of sound in two-dimensional sonic crystals. It is shown that, for given frequencies and directions of incidence, a narrow sonic beam can propagate without diffractive broadening. Such nondiffractive sonic beams exist in crystals with perfect symmetry, and do not require the presence of defects, differently from other waveguiding phenomena reported previously. The cancellation of diffraction has been predicted using the plane-wave expansion method to evaluate the dispersion surfaces of the crystal and the spatial dispersion (isofrequency) curves. It occurs for frequencies and wavevectors for which dispersion curves have zero curvature, denoting a transition between focusing and defocusing regimes. By means of perturbative techniques, a simple analytical expression for the nondiffractive conditions has been obtained. The phenomenon is also demonstrated by numerical integration of the acoustic equations using the FDTD technique with very good agreement with the preliminary experimental results. Support from Spanish MEC, project FIS2005-07931-C03-01, is acknowledged.
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Tom
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85--92
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Bibliogr. 6 poz., rys., tab.
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autor
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- Departament de Física Aplicada, Escola Politčcnica Superior de Gandia, Universitat Politčcnica de Valčncia, vespinos@fis.upv.es
Bibliografia
- [1] E. Yablonovitch, Phys. Rev. Lett. Vol. 58, 2059, 1987; S. John, Phys. Rev. Lett. Vol. 58, 2486, 1987.
- [2] T. Miyashita, Meas. Sci. Technol. Vol. 16, R47-R63, 2005, Page JH et al., Phys. Stat. Sol. Vol. 241, 3454-3462, 2004.
- [3] R. Morandotti et al., Phys. Rev. Lett. Vol. 86, 3296, 2001 and M.J. Ablowitz and Z.H. Musslimani, Phys. Rev. Lett. Vol. 87, 254102, 2001.
- [4] Suxia Yang et al, Phys. Rev. Lett. 93, 024301, 2004; M. Torres and F.R. Montero de Espinosa, Ultrasonics Vol. 42, 787, 2004.
- [5] K. Staliunas, R. Herrero, Phys. Rev. E, Vol. 73, 016601, 2006.
- [6] I. Perez-Arjona, V.J. Sanchez-Morcillo, J. Redondo, V. Espinosa, K. Staliunas, Theoretical prediction of the nondiffractive propagation of sonic waves through periodic acoustic media, Phys. Rev. B, Vol. 75, 1, 14304, 2007.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWM8-0037-0011