A novel method for tuning the band gap structure of 2D phononic crystals

Our study encompasses the phenomena associated with gradual symmetry reduction in phononic crystals (PnC). As the lattice of the PnC is deformed, transmission spectrum shows a change in the shape, position and the size of the band gaps. More important, a pass band inside the stop band develops. The practical feasibility of the phenomena for a sensor application of a PnC is demonstrated for the 2D case of a solid matrix and liquid inclusions. A distinct pattern of the pass band build-up and its alteration induced by both the lattice deformation and the change of the material properties of inclusions are demonstrated.