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 …

Performance of classic sound absorbing materials strictly depends on their thickness, with a
minimum of one-quarter wavelength to reach full sound absorption. In this paper, we report …

In the recent decade, there are increasing numbers of reported studies on the use of
acoustic black hole (ABH) effects for the damping of flexural vibrations in engineering …

The curved space-time produced by black holes leads to the intriguing trapping effect. So
far, metadevices have enabled analogous black holes to trap light or sound in laboratory …

We present the design, construction, and experimental characterization of the acoustic
analogue of the so called photonic black-hole. The fabricated sample has cylindrical …

The acoustic black hole (ABH) effect for sound reduction in duct terminations can be
accomplished by means of retarding structures. The latter act as waveguides and their …

Acoustic black holes (ABHs) in plates have shown great potential in a variety of applications
that range from passive noise and vibration reduction, to energy harvesting thanks to …

We investigate tunable acoustic absorption enabled by the coherent control of input waves.
It relies on coherent perfect absorption originally proposed in optics. By designing …

The transfer matrix method has been proposed to analyze the acoustic black hole effect in
duct terminations. The latter is achieved by placing a retarding waveguide structure inside …

Perfect sound absorbers with a deep-subwavelength thickness are important to applications
such as noise reduction and sound detection. But their absorption bandwidths are usually …