Experimental investigation of negative refraction and imaging of 8-fold-symmetry phononic quasicrystals

The focus behaviors of acoustic wave through 8-fold-symmetry phononic quasicrystals have been observed experimentally in this paper. By measuring the field distributions in the image plane, we obtain an elongated image of a point source which has a similar result with phononic crystals. The negative refraction index was measured in two different ways which are very consistent with each other. These properties make the phononic quasicrystals (PQCs) promising for application in a range of phononic devices.