Acoustic coding metamaterial based on non-uniform Mie resonators

Acoustic coding metamaterials have important applications in simplifying design procedure and providing a flexible approach to realize complicated functions. Here, we design a 1-bit coding metamaterial for flexibly manipulating the sound propagation path. The capability of subwavelength acoustic propagation control on coding metamaterial is attributed to the dipole-like characteristic of the Mie resonator. The Mie resonator with a subwavelength scale is constructed with a non-uniform structure, which can generate Mie resonance with dipole-like characteristic. Two kinds of coding elements are introduced by horizontally or vertically reversing the Mie resonator in each element. To verify the performance of the designed coding metamaterials, three specific metamaterial patterns are fabricated to give different trajectories of sound propagation. Our finding may open an avenue for designing acoustic metamaterials and is expected to design intelligent acoustic devices with exciting reconfigurable and programmable applications. Published under an exclusive license by AIP Publishing.

Automated summary

This study designs a 1-bit coding metamaterial that can flexibly manipulate the sound propagation path. The subwavelength acoustic propagation control is achieved through the dipole-like characteristic of the Mie resonator. Different metamaterial patterns are fabricated to verify the performance of the designed coding metamaterial.