Zero-spacing waveguide array acoustic circuit based on superimposed Mie resonator

Abstract

Cladding layer between acoustic waveguides, widely used in acoustic circuits, can prevent crosstalk between waveguides. Here a superimposed Mie resonator (SMR) with anisotropic spatial dispersion is proposed as an adjustable unit to realize cladding-free acoustic circuit. The SMR is formed by overlapping two conventional Mie resonators. By analyzing the complementary waveguide modes between the SMRs and free-space, an acoustic circuit with zero-spacing waveguide arrays is constructed. On this basis, effective control of the acoustic wave transmission path is achieved, leading to the design of acoustic circuits such as sharp bend, routing, and branching. Furthermore, by adding hard-boundary small spheres at the bends of the acoustic circuit, acoustic wave leakage is significantly reduced, and crosstalk between different channels is minimized. This research explores the integration of waveguide physics with acoustic circuits, offering valuable perspectives on their interaction.