Acoustic metamaterials, structured to produce anomalous reflection and refraction indices
that are not found in conventional materials, are gaining prominence in engineering …

The introduction of engineered resonance phenomena on surfaces has opened a new
frontier in surface science and technology. Pillared phononic crystals, metamaterials, and …

In the past decades, many mechanical metamaterials with uncommon static properties have
been reported. On the other hand, mechanical metamaterials possessing extraordinary …

The effective operation of certain electronic, medical, industrial, and testing equipment relies
on high-quality focusing and imaging capability, which also plays a vital role in the field of …

By using a structured tungsten-polyurethane composite that is impedance matched to water
while simultaneously having a much slower longitudinal sound speed, we have theoretically …

Piezoelectric nanogenerator (PENG) was first introduced by using piezoelectric nanowires
for converting tiny mechanical energy into electric power. 1 Research in nanogenerators has …

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 …

Phononic crystals and acoustic metamaterials are periodic structures whose effective
properties can be tailored at will to achieve extreme control on wave propagation. Their …

Metasurfaces are planar metamaterials with a flat surface and a subwavelength thickness
that are able to shape arbitrary wave fronts such as focusing or imaging. There is a broad …

Functionally gradient materials (FGM) have gradual variations in their properties along one
or more dimensions due to local compositional or structural distinctions by design …