The study of classical wave physics has been reinvigorated by incorporating the concept of
the geometric phase, which has its roots in optics, and topological notions that were …

Mechanical metamaterials and phononic crystals enable localizing, focusing, and guiding of
elastic or acoustic waves in various ways. Here, we describe the physical mechanisms …

In solid state physics, a bandgap (BG) refers to a range of energies where no electronic
states can exist. This concept was extended to classical waves, spawning the entire fields of …

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 …

The study of phononic materials and structures is an emerging discipline that lies at the
crossroads of vibration and acoustics engineering and condensed matter physics. Broadly …

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

The phonon is the physical particle representing mechanical vibration and is responsible for
the transmission of everyday sound and heat. Understanding and controlling the phononic …

The advancement in electromagnetic metamaterials, which commenced three decades ago,
experienced a rapid transformation into acoustic and elastic systems in the forms of …

Phononic crystals (PnCs) are novel synthetic periodic materials for controlling and
manipulating the propagation of elastic (or acoustic) waves. The periodic nature of PnCs …

The emergence of artificially designed subwavelength electromagnetic materials, denoted
metamaterials,,,,,,,,,, has significantly broadened the range of material responses found in …