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 …

Photonic time crystals are artificial materials whose electromagnetic properties are uniform
in space but periodically vary in time. The synthesis of these materials and experimental …

Gratings which are in apparent motion reveal some startling properties for classical
radiation, especially for luminal gratings traveling at or around the speed of light. We show …

We present an experimental study of optical time-refraction caused by time-interfaces as
short as a single optical cycle. Specifically, we study the propagation of a probe pulse …

Time reflection and refraction are temporal analogies of the spatial boundary effects derived
from Fermat's principle. They occur when classical waves strike a time boundary where an …

In the continuously evolving realm of nonlinear optics, epsilon near zero (ENZ) materials
have captured significant scientific interest, becoming a compelling focal point over the past …

Optical metasurfaces have recently emerged as the game changer in light manipulation and
opened up new perspectives in many subfields of optics and photonics. Recent …

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 …

We study the time reflection and time refraction of waves caused by a spatial interface with a
medium undergoing a sudden temporal change in permittivity. We show that monochromatic …

Temporal metamaterials empower novel forms of wave manipulation with direct applications
to quantum state transformations. In this work, we investigate vacuum amplification effects in …