二维声子准晶体负折射效应的实验研究

he focus behaviors of acoustic wave through two-dimensional 8-fold-symmetry phononic quasicrystals have been observed experimentally in this paper. The imaging experimental results exhibit obvious negative focus effects: a compressed image of a point source, which has a round distribution without the phononic quasicrystal, was obtained in the parallel plane of the sample\\\'s surface, while an elongated image with a certain focal length emerged in the vertical plane. Meanwhile, we experimentally measured and analyzed the negative refraction index with this sample in two different ways, which is a further proof of negative refraction effect for this system.