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 …

We show that by coiling up space using curled perforations, a two-dimensional acoustic
metamaterial can be constructed to give a frequency dispersive spectrum of extreme …

Unidirectional devices that pass acoustic energy in only one direction have numerous
applications and, consequently, have recently received significant attention. However, for …

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 …

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

We report the design of a gradient index acoustic lens by coiling up space, an entirely
different, yet more direct approach compared with previous designs. The proposed model …

Acoustic metamaterials (AMs) for sound wave manipulation have attracted significant
attention due to their fascinating functionalities, such as anomalous reflection/refraction …

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