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

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

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

Based on the form‐invariance of Maxwell's equations under coordinate transformations,
mathematically smooth deformation of space can be physically equivalent to …

Rapid advances have been made in the properties of metastructures, including phononic
crystals, metamaterials, and metasurfaces, with respect to their robustness, high power …

In this paper, a novel gradient index (GRIN) structural lens based on the concept of
generalized Luneburg lens (GLL) is proposed. This lens allows for the realization of double …

Luneburg lens is a symmetric gradient-index lens with a refractive index that increases from
the outer surface to the center in a radial manner. It has the ability to focus and collimate …

An elastic metasurface is an artificial structure composed of subwavelength structures that
can manipulate elastic waves with an arbitrary phase gradient transformation. However …

Metasurfaces of mechanical resonators have been successfully used to control in-plane
polarized surface waves for filtering, waveguiding and lensing applications across different …

Controlling and manipulating elastic/acoustic waves via artificially structured metamaterials,
phononic crystals, and metasurfaces have gained an increasing research interest in the last …