Total transmission and total reflection of acoustic wave by zero index metamaterials loaded with general solid defects

TL;DR

This paper explores how zero index metamaterials with embedded solid defects can be tuned to achieve total acoustic wave transmission or reflection, advancing control over acoustic wave propagation.

Contribution

It introduces a method to manipulate acoustic waves in ZIM waveguides with solid defects, analyzing effects of defect wave speeds on transmission and reflection.

Findings

Total transmission and reflection are controllable via defect parameters.

Longitudinal and transverse wave speeds significantly influence wave propagation.

A 2D acoustic crystal system demonstrates these effects practically.

Abstract

This work investigates acoustic wave transmission property through a zero index metamaterials (ZIM) waveguide embedded with a general solid defect. Total transmission and total reflection can be achieved by adjusting the parameters of the solid defect. We comprehensively study how longitudinal/transverse wave speeds of the solid defect affect the acoustic wave propagation through the waveguide. A two-dimensional (2D) acoustic crystals (ACs) system with zero index is used to realize these intriguing transmission properties. Thus, our work provides more possibilities to manipulate acoustic wave propagation through ZIM.