Non-Hermitian theory is a theoretical framework used to describe open systems. It offers a
powerful tool in the characterization of both the intrinsic degrees of freedom of a system and …

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

Chirality is one of the fundamentals of nature with strong ties to asymmetry. In wave physics,
it is conventionally characterized by asymmetric scattering of circularly polarized waves but …

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

Metalens, a two-dimensional planar system composed of strategically engineered
subwavelength structures, facilitates precise manipulation in the process of both light and …

We present a non-Hermitian metabeam exhibiting an exceptional point (EP) induced by
enforcing parity-time (PT) symmetry through applied external forces. The EP is formed by the …

Non-Hermitian systems that possess loss and gain have been receiving a great deal of
interest in various wave problems demonstrating diverse unprecedented wave phenomena …

We propose an acoustic-mechanical metasurface with simultaneous sound absorption and
vibration reduction functionalities. This acoustic-mechanical feature results from a nonlocal …

Recently, by tailoring the local phase, the emergence of acoustic metasurfaces such as
gradient-index metasurfaces (GIMs) shows an exotic way of redirecting sound waves. With a …