Fig. 5: Wavefield guiding along spatiotemporal paths.
From: Dynamic shaping of multi-touch stimuli by programmable acoustic metamaterial
a Activation sequence of LRAs supplied with Slepian-windowed carrier signals. Up to five LRAs were activated simultaneously. b Recorded acceleration field following a linear spatiotemporal reference path represented by the dashed line. c Evolution of the vibration spot for various path speeds, and corresponding linear fits. d Spatiotemporal vibration maps for frequencies below, inside, and above the band gap. The top row was obtained by bilinear interpolation of the RMS acceleration, and the bottom row by Otsu’s binarization. e Sinusoidal reference path sweeping the metamaterial lengthwise at 3 Hz. f Metrics for assessing path-following effectiveness. Lower values indicate better performance.
