Tunable Transmission and Deterministic Interface states in Double-zero-index Acoustic Metamaterials

Area of Science:

• Acoustic metamaterials
• Solid-state physics
• Wave phenomena

Background:

• Building upon seminal work, this research investigates acoustic metamaterials.
• Acoustic metamaterials offer unique wave manipulation capabilities.

Purpose of the Study:

• To explore a double-zero-index acoustic metamaterial with a triangular lattice.
• To demonstrate tunable and asymmetric acoustic transmission.
• To investigate band inversion and interface states.

Main Methods:

• Numerical simulation of acoustic dispersion in a parallel-plate waveguide.
• Manipulation of air scatterer dimensions (height and diameter).
• Analysis of accidental degeneracy between monopolar and dipolar modes.

Main Results:

• Numerical proof of double-zero-index properties in the designed metamaterial.
• Realization of acoustic waveguides with tunable and asymmetric transmission.
• Observation of band inversion and deterministic interface states.

Conclusions:

• The developed double-zero-index acoustic metamaterial enables precise control over acoustic wave propagation.
• This work opens avenues for novel acoustic devices and applications.
• The findings highlight the potential of engineered acoustic structures for advanced functionalities.