抄録
Lens effect of acoustic waves in a two-dimensional (2D) phononic crystal is studied by numerical simulation based on the finite-difference time-domain (FDTD) method. We calculate the phonon band structure of 2D phononic crystals, consisting of metal cylinders placed periodically in water. Lens effect is observed for far-field wave in the phononic crystal with graded-index structure. These results indicate that a novel energy-transmission device can be designed using phononic crystals.
