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 …

This tutorial offers a comprehensive overview of photonic time crystals: artificial materials
whose electromagnetic properties are periodically modulated in time at scales comparable …

When an electromagnetic (EM) wave propagates in a medium whose properties are varied
abruptly in time, the wave experiences refractions and reflections known as time-refractions …

Dynamic metasurfaces have emerged as a disruptive change in the way the response of
optical systems can be tailored by combining the flexibility of flat optics in spatially …

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 …

Experimental demonstration of tunable temporal Goos-Hänchen shift (GHS) in synthetic
discrete-time heterolattices with scalar and vector gauge potentials is reported. By using …

The interaction between light and the time-varying medium exhibits non-Hermitian
characteristics, leading to intriguing phenomena, such as parametric amplification …

Time-varying metamaterials are currently at the forefront of research, offering immense
possibilities for intriguing wave manipulations. Temporal modulations of metamaterials have …

Time-invariant photonic structures amplify or absorb light based on their intrinsic material
gain or loss. The coherent interference of multiple beams in space, eg, in a resonator, can …

Coherent wave control is of key importance across a broad range of fields such as
electromagnetics, photonics, and acoustics. It enables us to amplify or suppress the …