In electromagnetics and photonics,'nonlocality'refers to the phenomenon by which the
response/output of a material or system at a certain point in space depends on the input field …

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

Causality of linear time-invariant systems inherently defines the wave-matter interaction
process in wave physics. This principle imposes strict constraints on the interfacial response …

Sound absorption structures, as an effective approach to reducing sound radiation, have
always received extensive attention in the engineering of vibration and noise reduction. In …

Sound-absorbing materials (SAMs) have attracted significant interest for more than a century
owing to their rich physical properties and extensive potential in acoustic engineering. This …

Acoustic metasurfaces offer unique capabilities to steer and direct acoustic fields, though
these are generally composed of complex 3D structures, complicating their fabrication and …

Acoustic metasurfaces are at the frontier of acoustic functional material research owing to
their advanced capabilities of wave manipulation at an acoustically vanishing size. Despite …

Acoustic metasurface has become one of the most promising platforms for manipulating
acoustic waves with the advantage of ultra-thin geometry. The conventional design method …

Acoustic absorbers based on resonant cavities or porous materials have been extensively
investigated for develo** acoustic liners but still suffer from narrow working frequency …

A novel design for hierarchical-porous acoustic metamaterials (HPAM) is proposed to
enhance the functionality of Helmholtz-type resonators and porous materials, achieving …