In the field of nanophotonics, metasurfaces have come to the forefront in real‐world
applications, owing to their accessible exotic optical properties that can be readily designed …

Acoustic/elastic metasurfaces as a kind of two-dimensional metamaterials are of
subwavelength thickness and show remarkable ability of acoustic/elastic wave …

In this Letter, we introduce a new paradigm for achieving robust asymmetric generation of
acoustic vortex field through dual-layer metasurfaces by controlling their intrinsic topologic …

Reciprocity is a fundamental principle of wave physics related to time-reversal symmetry.
Nonreciprocal wave behaviors have been pursued for decades because of their great …

Acoustic vortices provide a single-beam approach to manipulate objects with sizes from
nanometers to millimeters, gaining increasing interest in recent years. The helical beam …

Vortex beams carrying orbital angular momentum enrich the wave-matter interaction physics
and show great potential applications, such as optical or acoustic tweezers and long-range …

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

Recent years have witnessed a rapidly growing interest in exploring the use of spiral sound
carrying artificial orbital angular momentum (OAM), toward establishing a spiral-wave-based …

The simple acoustic field generated by conventional transducers limits the development of
ultrasound applications. Current methods rely on passive acoustic lenses or active arrays to …

As the dominant information carrier in water, the acoustic wave is widely used for
underwater detection, communication and imaging. Even though underwater acoustic …