Fig. 1: Schematic of OAM- and frequency-dependent high-capacity encrypted acoustic holography. | Nature Communications

Fig. 1: Schematic of OAM- and frequency-dependent high-capacity encrypted acoustic holography.

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

Fig. 1

The multiple holographic images are stored in different OAM and frequency channels and can be reconstructed by illuminating the holography metasurface with incident beams with the corresponding combination of specific OAM and frequency. The diagram illustrates a specific multiplexing example involving two OAM modes (±1) and two frequency channels.

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