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

This broad review summarizes recent advances and “hot” research topics in nanophononics
and elastic, acoustic, and mechanical metamaterials based on results presented by the …

Multifunctional materials are in high demand for practical engineering applications. Owing to
the ubiquitous noise and impact energy hazards in many settings, traditional materials and …

Broadband sound sink/absorber via a structure with deep sub-wavelength thickness is of
great and continuing interest in physics and engineering communities. An intuitive technique …

Perfect, broadband and asymmetric sound absorption is theoretically, numerically and
experimentally reported by using subwavelength thickness panels in a transmission …

Acoustic metamaterials (AMs), which are materials composed of subwavelength periodic
artificial structures with specific designs, have drawn significant research attention. This is …

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 …

Acoustic metamaterials with broadband sound-absorbing capacity open up applications in
aerospace, automotive, marine, defense, etc. For such applications, sound-absorbing …

Although mutually independent, simultaneous sound absorption and superior mechanical
properties are often sought after in a material. One main challenge in achieving such a …

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 …