In elastic wave systems, combining the powerful concepts of resonance and spatial grading
within structured surface arrays enable resonant metasurfaces to exhibit broadband wave …

We experimentally achieve wave-mode conversion and rainbow trapping in an elastic
waveguide loaded with an array of resonators. Rainbow trapping is a phenomenon that …

We experimentally demonstrate that a rainbow-based metamaterial, created by a graded
array of resonant rods attached to an elastic beam, operates as a mechanical delay-line by …

Important distinctions are made between two related wave control mechanisms that act to
spatially separate frequency components; these so-called rainbow mechanisms either slow …

The rainbow reflection effect describes the broadband spatial separation of wave spectral
components caused by a spatially graded array of resonators. Although mainly studied in …

Motivated by the importance of lattice structures in multiple fields, we numerically investigate
the propagation of flexural waves in a thin reticulated plate augmented with two classes of …

A reinforcement learning approach to design optimised graded metamaterials for
mechanical energy confinement and amplification is described. Through the proximal policy …

A structure capable of substantially amplifying water waves over a broad range of
frequencies at selected locations is proposed. The structure consists of a small number of C …

We show efficient elastic energy transfer and wave confinement through a graded array of
resonators attached to an elastic beam. Experiments demonstrate that flexural resonators of …

The rainbow trapping phenomenon of graded metamaterials can be combined with the
fractal spectra of quasiperiodic waveguides to give a metamaterial that performs fractal …