Time-varying media have recently emerged as a new paradigm for wave manipulation, due
to the synergy between the discovery of highly nonlinear materials, such as epsilon-near …

BACKGROUND Metasurfaces have opened up a number of remarkable new approaches to
manipulate light. These flat optical elements are constructed from a dense array of strongly …

Efficient nonlinear optical interactions are essential for many applications in modern
photonics. However, they typically require intense laser sources and long interaction …

Metasurfaces, a two-dimensional (2D) form of metamaterials constituted by planar meta-
atoms, exhibit exotic abilities to tailor electromagnetic (EM) waves freely. Over the past …

Optical metasurfaces with subwavelength thickness hold considerable promise for future
advances in fundamental optics and novel optical applications due to their unprecedented …

Abstract Space-time duality in paraxial optical wave propagation implies the existence of
intriguing effects when light interacts with a material exhibiting two refractive indexes …

Here we present a roadmap on Photonic metasurfaces. This document consists of a number
of perspective articles on different applications, challenge areas or technologies underlying …

The discovery, design and development of materials are critically linked to advances in
many areas of research, and optics is no exception. Recently, the spectral region in which …

Creating materials with time-variant properties is critical for breaking reciprocity that imposes
fundamental limitations on wave propagation. However, it is challenging to realize efficient …

Metasurfaces, planer artificial materials composed of subwavelength unit cells, have shown
superior abilities to manipulate the wavefronts of electromagnetic waves. In the last few …