Dynamic shaping of multi-touch stimuli by programmable acoustic metamaterial

Thomas Daunizeau (), Sinan Haliyo, David Gueorguiev and Vincent Hayward
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Thomas Daunizeau: Sorbonne Université, CNRS ISIR
Sinan Haliyo: Sorbonne Université, CNRS ISIR
David Gueorguiev: Sorbonne Université, CNRS ISIR
Vincent Hayward: Sorbonne Université, CNRS ISIR

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract Acoustic metamaterials are artificial structures, often lattice of resonators, with unusual properties. They can be engineered to stop wave propagation in specific frequency bands. Once manufactured, their dispersive qualities remain invariant in time and space, limiting their practical use. Actively tuned arrangements have received growing interest to address this issue. Here, we introduce a new class of active metamaterial made from dual-state unit cells, either vibration sources when powered or passive resonators when left disconnected. They possess self-tuning capabilities, enabling deep subwavelength band gaps to automatically match the carrier signal of powered cells, typically around 200 Hz. Swift electronic commutations between both states establish the basis for real-time reconfiguration of waveguides and shaping of vibration patterns. A series of experiments highlight how these tailored acceleration fields can spatially encode information relevant to human touch. This novel metamaterial can readily be made using off-the-shelf smartphone vibration motors, paving the way for a widespread adoption of multi-touch tactile displays.

Date: 2025
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DOI: 10.1038/s41467-025-63560-6

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