Tailoring 2D phononic crystal sensor properties by lattice symmerty reduction

We propose a novel method of tailoring the band structure of 2D phononic crystals (PnC) by reducing the lattice symmetry. Specifically, symmetry reduction by stretching and distorting the crystal face is explored. The transmission spectrum of the PnC was numerically calculated using the layer multiple-scattering method. Change in the shape and size of the band gaps is demonstrated as well as form of pass bands inside the stop band. The practical feasibility of the PnC sensor concept was evaluated for the case of synthetic quartz matrix and water inclusions. A distinct pattern of the pass band transformation inside the stop band which is induced by changing the distortion angle was demonstrated. The approach is in particular useful in adjusting the size and position of the gap and tailoring the size and position of the pass band in PnC sensors.