Figure 2. Experimental setup for measuring the holographic rendering of the acoustic metamaterial-based holograms.

(a) A photo showing the experimental setup. A scanning stage inside an anechoic chamber is employed for mapping the fields at certain depths. (b) The photograph of a fabricated hologram that is composed of 512 unit cells. (c) The set of 12 constituting unit cells used to achieve gradient phase delays. (d) The layout of the holographic reconstruction system. (e) The simulated results of a random calibration hologram with ASA and Finite Element Method (FEM)-based full wave simulation, as well as the corresponding measurement.