Phononic Band Gap Width Control through Structural and Material Parameters in Two-Dimensional Phononic Crystals

摘要: The phononic band structures of two-dimensional solid crystals with different lattice and scatterer symmetry are studied numerically, three types (square, triangular, rectangular) four shapes (circle, hexagon, square, rectangle) considered. XY Z vibration modes investigated separately. Two crystal considered: one composed high-density rods embedded in a low-density matrix, the other matrix. In former case, type polarization being fixed, broadest gaps obtained when corresponds to that (the shape rod is identical first Brillouin zone); largest gap width values observed triangular lattice-based (compared those based on square rectangular lattices), corresponding zone closest circle. These rules do not apply which density material lower than this lattice, either fail appear at all, or much narrower configurations. effect parameter (such as longitudinal transversal velocity values) relation between energy found be lesser.