The effect of the geometrical parameters and composing materials type on the bandgap width of two-dimensional phononic crystals

In this article, the bandgap of the two-dimensional phononic crystal with some holes in a square plane was studied using the finite element method in the Comsol software. The holes are made of both some solids and liquids simultaneously in our phononic crystals that is less studied so far. We examined the fixed lattice constant while the cavity radius changes and vice versa. We found a larger bandgaps width when the cavity was made of nickel metal while the surrounding media is water. We; observed that the system with higher sound speed possesses more significant band gap.At higher temperatures, we will have a higher sound speed, and thus, a higher bandgap width. we have a smaller bandgap when the holes are covered by metal. The main aim of the manuscript was to find an optimum structure that have a phononic crystal with largest passible phononic band gap for filtering properties applications. In this way, we have considered the effect of different parameters such as lattice constant, composing materials, phononic crystal geometry, temperature on the phononic bandgap width.

Keywords:

Phononic crystal , bandgap , lattice constant