Propagation of Lamb waves in one-dimensional quasiperiodic composite thin plates: A split of phonon band gap

The authors study numerically the propagation of Lamb waves in one-dimensional quasiperiodic composite thin plates made of tungsten $\left(B\right)$ and silicon resin $\left(A\right)$ arranged according to a Fibonacci sequence. It is found that the band-gap structures of Lamb waves are very different from those of bulk waves. The split of band gaps is independent of the number of layers, which is different from the quasiperiodic bulk photonic and phononic crystals. Possible applications are discussed.