Figure 2: An AM by coiling up space for generalized Snell’s law.
From: Sound Insulation in a Hollow Pipe with Subwavelength Thickness
(a) One period of the proposed metasurface with eight units and its structural parameters. (b) Dependence of the reflected phase on the width d1 marked by black dots for an individual unit cell of labyrinthine metastructure contained in the structure shown in (a). (c) The pressure stripes of the acoustic waves which are reflected by the eight units. The high maps of pressure field are utilized to clearly show the different phase shifts by each unit at working frequency of 4346 Hz.
