Acoustic metamaterial science is an emerging field at the frontier of modern acoustics. It
provides a prominent platform for acoustic wave control in subwavelength-sized …

Phononic crystals and acoustic metamaterials are periodic structures whose effective
properties can be tailored at will to achieve extreme control on wave propagation. Their …

Acoustics is a classical field of study that has witnessed tremendous developments over the
past 25 years. Driven by the novel acoustic effects underpinned by phononic crystals with …

A 3D-printed gradient-index phononic crystal structure based on air inclusions in a polymer
is introduced to manipulate underwater acoustic waves. The proposed approach enables a …

Acoustic Luneburg lens (ALL) is a spherically/circularly symmetric gradient refractive index
lens, whose index varies smoothly from the outer surface to the centre. The variation of the …

Motivated by the importance of lattice structures in multiple fields, we numerically investigate
the propagation of flexural waves in a thin reticulated plate augmented with two classes of …

We report ultrasound beam steering based on 2D and 3D flattened acoustic metamaterial
Luneburg lenses at 40 kHz. The effective properties of the lenses are obtained by using the …

The black hole equipment or concentrator plays an important role in harnessing the wave
energy, which has the potential application in the energy collecting engineering. In this work …

We propose and demonstrate a compact acoustic retroreflector that reroutes incident signals
back toward the source with minimal scattering. Gradient refractive index acoustic …

Most current strategies for designing tunable locally resonant metamaterials are based on
tuning the stiffness of the resonator; however, this approach presents a major shortcoming …