Fig. 3: Meta-pixels for implementing the multi-dimensional multiplexed metasurface. | Nature Communications

Fig. 3: Meta-pixels for implementing the multi-dimensional multiplexed metasurface.

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

Fig. 3

a Schematic diagram of a meta-pixel consisting of two amplitude-phase modulation subunits with high frequency selectivity. Subunits 1 and 2 are marked as S1 and S2, respectively. b Cross-sectional view of S1 and S2. \({W}_{i}^{1,\,2}\), \({D}_{i}^{1,\,2}\), and \({H}_{i}^{1,\,2}\) are the length, width, and height of the i-th layer of S1 and S2, respectively. Specifically, \({H}_{6}^{1,\,2}\) is the total length of the zig-zag pipe in Layer 6. c Transmission curves of subunit 1 and subunit 2 from 12 kHz to 20 kHz. d The amplitude distribution of the internal sound field through the unit cell at 13720 Hz (left) and 17150 Hz (right).

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