Abstract
The transmission of longitudinal waves through solid superlattices is studied. The waves income from a fluid or a solid and the transmission medium is a fluid. It is found that the transmission spectrum is closely related to the free-stress surface vibrational modes in the superlattice slab. The correspondence of the transmission peaks with these modes is better when the impedance contrast between the external medium and the superlattice is high. Results for normal and oblique waves in a superlattice of Al/W embedded in Hg, water, or air are presented. As the impedance of the external medium changes it is found new minigaps for the wave transmission inside the allowed frequency region for bulk propagation. Additional structure to the transmission spectrum is produced by localized excitations. Transmission with frequencies in the gap is assisted by the occurrence of surface waves and enhanced transmission is observed inside the frequency bands due to the presence of surface resonances. Theoretical results for a Pt/W superlattice are presented. B.M-M. is grateful to CONACyT Mexico, for a doctorate scholarship. [Work supported by CONACyT Mexico, Grant No. 35541-E.]
Published Version
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