Fig. 5: Experimental verification of the OAM- and frequency-dependent hologram. | Nature Communications

Fig. 5: Experimental verification of the OAM- and frequency-dependent hologram.

From: Orbital angular momentum- and frequency-dependent high-capacity encrypted hologram through multi-dimensional multiplexing acoustic metasurface

Fig. 5

a Theoretically calculated transmitted amplitude and phase profiles of the hologram metasurface for reconstructing the desired holographic images at 13720 Hz (top) and 17150 Hz (bottom). The amplitude is plotted in arbitrary units (arb. units). b Photograph of the fabricated metasurface sample. The size of the sample is 0.4 × 0.4 × 0.06 m3. c Experimental setup. d Left panel: Simulated (Sim.) two-dimensional acoustic intensity distribution under different OAM and frequency incidences; Middle panel: experimental (Exp.) two-dimensional acoustic intensity patterns under different OAM and frequency incidences; Right panel: simulated (dashed line) and measured (solid line) one-dimensional acoustic intensity profiles along dashed lines marked in the left panel.

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