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 …

Metamaterials with a Dirac-like cone dispersion at the center of the Brillouin zone behave
like an isotropic and impedance-matched zero refractive index material at the Dirac-point …

Light travels in a zero-index medium without accumulating a spatial phase, resulting in
perfect spatial coherence. Such coherence brings several potential applications, including …

Coherent perfect absorption (CPA), as time-reversed lasing, arises from appropriate wave
interference within absorbers, offering flexible control over wave absorption. Typically, this …

We report the first realization of a three-dimensional (3D) acoustic double-zero-index
medium (DZIM) made of a cubic lattice of metal rods. While the past decade has seen …

Light reflection and refraction at an interface between two homogeneous media is
analytically described by Snell's law. For a beam with a finite waist, it turns out that the …

Accidental degeneracy plays an important role in the generation of novel band dispersions.
Photonic structures that exhibit an accidental Dirac-like conical dispersion at the center of …

We show how one may obtain conical (Dirac) dispersions in photonic crystals, and in some
cases, such conical dispersions can be used to create a metamaterial with an effective zero …

Electromagnetic void space is a medium, while geometrically occupying a finite volume of
space, optically equivalent to an infinitesimal point, in which electromagnetic waves do not …

We develop a continuum model, valid at high frequencies, for wave propagation through
elastic media that contain periodic, or nearly periodic, arrangements of traction free, or …