Acoustic metamaterials can manipulate and control sound waves in ways that are not
possible in conventional materials. Metamaterials with zero, or even negative, refractive …

The coupling of waves between the piezoelectric generators, detectors, and propagating
media is challenging due to mismatch in the acoustic properties. The mismatch leads to the …

Within a time span of 15 years, acoustic metamaterials have emerged from academic
curiosity to become an active field driven by scientific discoveries and diverse application …

As a new kind of artificial material developed in recent decades, metamaterials exhibit novel
performance and the promising application potentials in the field of practical engineering …

The causal nature of the acoustic response dictates an inequality that relates the two most
important aspects of sound absorption: the absorption spectrum and the sample thickness …

The recent advent of acoustic metamaterials has initiated a strong revival of interest on the
subject of sound absorption. The present review is based on the physics perspective as the …

Acoustic resonances in open systems, which are usually associated with resonant modes
characterized by complex eigenfrequencies, play a fundamental role in manipulating …

By using a structured tungsten-polyurethane composite that is impedance matched to water
while simultaneously having a much slower longitudinal sound speed, we have theoretically …

Greater demands for underwater sound absorption materials have been growing due to the
concern about underwater noise control in water. Among the range of existing materials …

Effective medium theory dates back to the early days of the theory of electricity. Faraday
1837 proposed one of the earliest models for a composite metal-insulator dielectric, and …