Realizing Acoustic Cloaking and Near-Zero Density with Acoustic Metastructure
- 638 Downloads
This chapter proposes an acoustic metastructure which has the property of near zero density and is developed for acoustic invisibility cloaking. This acoustic metastructure sustains the characteristics of the reported acoustic cloaks derived by transformation acoustics, and is also able to overcome the defect of topologically-optimized acoustic cloaks. Different from the traditional acoustic metamaterials which have complex (inhomogeneous or anisotropic) components of micro or subwavelength scales, our acoustic metastructure for invisibility cloaking is only made of single-piece homogeneous elastic copper in an accessible layout, including one pressure absorber and one pressure projector connected by an isolated energy channel.