Subwavelength Acoustic Valley-Hall Topological Insulators Using Soda Cans Honeycomb Lattices
(a) Photograph of the experimental setup. (b) Simulated distributions of the absolute pressure fields along the straight interface with the frequency Hz within the band gap. (c) Experimental measured sound energy profile and the simulated results along the cutline in the middle of the crystal [red dashed line in (b)], which are labeled as red dots and black curve, respectively. (d) Relationship between the acoustic pressure amplitude above the soda can, which is chosen as the one near the interface labeled as yellow ellipse in (b), and the distance away from the surface of the soda can arrays in the vertical direction.