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

In order to improve and broaden the sound absorption performance of porous materials with
low flow resistance, this study proposes the composite meta-porous structure embedded …

This paper presents an acoustic metamaterial, coiled-up structure with porous lining (CSPL),
which is constructed by adding porous material lining to a coiled-up air channel for the …

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 …

We introduce a multicoiled acoustic metasurface providing quasiperfect absorption
(reaching 99.99% in experiments) at an extremely lowfrequency of 50 Hz, simultaneously …

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

Classical meta-absorber designs usually have a tradeoff between bandwidth, efficiency, and
thickness. Here, we introduce the concept of a nonlocal acoustic metasurface absorber by …

In this research, we propose and design an acoustic metamuffler (AMM) by coupling a
microperforated plate and a composite waveguide formed by a main waveguide and a …

Metasurface-based acoustic hologram projectors fabricated with fixed microstructures can
only generate the predesigned images at a single or few discrete frequencies. Here, a …