The engineering of the spatial and temporal properties of both the electric permittivity and
the refractive index of materials is at the core of photonics. When vanishing to zero, those …

Double-slit experiments—where a wave is transmitted through a thin double aperture in
space—have confirmed the wave–particle duality of quantum objects, such as single …

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 emission of thermal radiation is a physical process of fundamental and technological
interest. From different approaches, thermal radiation can be regarded as one of the basic …

Regarded as a promising alternative to spatially sha** matter, time-varying media can be
seized to control and manipulate wave phenomena, including thermal radiation. Here …

Time-varying metamaterials rely on large and fast changes of the linear permittivity. Beyond
the linear terms, however, the effect of a non-perturbative modulation of the medium on …

Recently, materials with vanishingly small permittivity, known as epsilon‐near‐zero (ENZ)
media, emerged as promising candidates to achieve nonlinear optical effects of …

Spacetime metamaterials are opening new regimes of light–matter interactions based on the
breaking of temporal and spatial symmetries, as well as intriguing concepts associated with …

Low-electron-density Drude (LEDD) materials such as indium tin oxide (ITO) are receiving
considerable attention for their combination of CMOS compatibility, unique epsilon-near …

We develop a compact theory that can be applied to a variety of time-varying dispersive
materials. The continuous-wave reflection and transmission coefficients are replaced with …