in their wave propagation characteristics. [1-3] Onedimensional (1D) PnCs are typically constructed by alternating between segments of two constituent materials or cross-sectional areas that have differing mechanical impedance. [4]. Elastic waves with wavelengths on the order of the PnC periodicity are scattered due to Bragg interferences, while waves at other frequencies are able to propagate through the material [5][6][7][8]. The bandwidth of nonpropagating waves within the PnC is de-
Transmission direction Lateral direction
Phononic crystal