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 …

Initially proposed to achieve strong noise isolation levels beyond the mass-density law,
acoustic metamaterials (AMMs) have now overturned the conventional views in all aspects …

Acoustic metamaterials derive their novel characteristics from the interaction between
acoustic waves with designed structures. Since its inception seventeen years ago, the field …

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 …

This paper provides a review and fundamental physical interpretation for the effective
densities and moduli of acoustic metamaterials. We introduce the terminology of hidden …

Local resonance band gaps in acoustic metamaterials are widely known for their strong
attenuation yet narrow frequency span. The latter limits the practical ability to implement …

The field of engineered materials with designed properties is expected to continue to grow in
the future, and metamaterials are instrumental in allowing this freedom of design …

By designing tailor-made resonance modes with structured atoms, metamaterials allow us to
obtain constitutive parameters outside their limited range from natural materials …

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

In the last few decades, metamaterials have revolutionized the ways in which waves are
controlled, and applied in physics and practical situations. The extraordinary properties of …