Flat optics has emerged as a key player in the area of structured light and its applications,
owing to its subwavelength resolution, ease of integration, and compact footprint. Although …

The topological properties of an object, associated with an integer called the topological
invariant, are global features that cannot change continuously but only through abrupt …

Bound states in the continuum (BICs) offer novel mechanisms to boost the quality factor (Q‐
factor) of resonances. Unfortunately, current studies on chiral BICs metasurfaces suffer from …

Dynamically controlling terahertz (THz) wavefronts in a designable fashion is highly desired
in practice. However, available methods working at microwave frequencies do not work well …

During the past few years, metasurfaces have been used to demonstrate optical elements
and systems with capabilities that surpass those of conventional diffractive optics. Here, we …

Metamaterials are composed of periodic subwavelength metal/dielectric structures that
resonantly couple to the electric and/or magnetic components of the incident …

This article reviews recent progress leading to the realization of planar optical components
made of a single layer of phase shifting nanostructures. After introducing the principles of …

We review the basic physics and applications of a special class of planar metamaterials,
often called metasurfaces, which are composed of optically thin and densely packed planar …

In the wake of intense research on metamaterials the two-dimensional analogue, known as
metasurfaces, has attracted progressively increasing attention in recent years due to the …

Metasurfaces are engineered interfaces that contain a thin layer of plasmonic or dielectric
nanostructures capable of manipulating light in a desirable manner. Advances in …