Abstract
We have demonstrated experimentally the occurrence of omnidirectional elastic bandgaps in layered periodic structures. To date, omnidirectional reflection is a well-known phenomenon for the case of electromagnetic waves in photonic crystals [Y. Fink et al., Science 282, 1679 (1998)]. Theoretically a similar behavior of the elastic waves in phononic systems is predictable [D. Bria and B. Djafari-Rouhani, Phys. Rev. E 66, 056609 (2002)]. For the experiment we used finite samples of alternating layers of Pb and epoxy. The binding medium is nylon, which is a material of high elastic velocity, a favorable condition to find the effect. The thicknesses of the layers were chosen in order to have omnidirectional gap at a few hundreds of kHz. We found good agreement between the experimental results and the theoretical treatment of the transmittance through finite samples and the phononic band structure. The effect is shown only for longitudinal impinging waves. [Work supported by CICyT of Spain and CONACyT of Mexico.]
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