Tunable acoustic transmission based on waveguide network metastructure

¹ College of Computer and Information Engineering (College of Artificial Intelligence), Nanjing Tech University Nanjing 211800, China
² Key Laboratory of Modern Acoustics, Institute of Acoustics and School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University - Nanjing 210093, China

Received: 11 December 2024
Accepted: 17 February 2025

Abstract

The tunable manipulation of sound propagation for on-chip waveguide is crucial for acoustic integrated circuits. Here, a non-uniform Mie resonator (NMR) with anisotropic spatial dispersion characteristic is proposed as an adjustable unit to realize tunable transmission across multiple paths within the waveguide network metastructure. The structure of the NMR has four waveguides with different refractive indexes obtained by zigzag waveguides, which can excite fixed and rotational anisotropic hyperbolic characteristics simultaneously. On this basis, NMR array metamaterials are integrated at the intersections of waveguide network metastructure. By varying the rotation angle of the NMRs, tunable control over the sound transmission paths within the waveguide network metastructure is achieved. Moreover, the proposed method allows for the simultaneous transmission of multiple non-intersecting sound paths without significant interference. Designed waveguide network metastructure opens a new avenue for improving the utilization efficiency in on-chip waveguide.