Noise pollution has become a significant global problem in recent years. Unfortunately,
conventional acoustic materials cannot offer substantial improvements in noise reduction …

Phononic crystals (PCs) and metamaterials (MMs) can exhibit abnormal properties, even far
beyond those found in nature, through artificial design of the topology or ordered structure of …

Inspired by sonic engineering, locally resonant metamaterials have attracted much attention
from researchers in civil engineering for their unique characteristics of stress wave …

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 …

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 …

We report a new type of phononic crystals with topologically nontrivial band gaps for both
longitudinal and transverse polarizations, resulting in protected one-way elastic edge …

The study of phononic materials and structures is an emerging discipline that lies at the
crossroads of vibration and acoustics engineering and condensed matter physics. Broadly …

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 …

Negative refraction of elastic waves has been studied and experimentally demonstrated in
three-and two-dimensional phononic crystals, but Bragg scattering is impractical for low …

Acoustic metamaterials offer great flexibility for manipulating sound waves and promise
unprecedented functionality, ranging from transformation acoustics, super-resolution …