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 …

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 …

In the past few years, concepts from non-Hermitian (NH) physics, originally developed within
the context of quantum field theories, have been successfully deployed over a wide range of …

Metasurfaces are subwavelength structured thin films consisting of arrays of units that allow
the control of polarization, phase, and amplitude of light over a subwavelength thickness …

A moving medium drags light along with it as measured by Fizeau and explained by
Einstein's theory of special relativity. Here we show that the same effect can be obtained in a …

We present a general framework for the homogenization theory of space-time
metamaterials. By mapping to a frame comoving with the space-time modulation, we derive …

Topological protection is a universal phenomenon that applies to electronic, photonic,
ultracold atomic, mechanical, and other systems. The vast majority of research in these …

Time has emerged as a new degree of freedom for metamaterials, promising new pathways
in wave control. However, electromagnetism suffers from limitations in the modulation speed …

The synergy between non-Hermitian concepts and topological ideas have led to very fruitful
activity in the recent years. Their interplay has resulted in a wide variety of new non …

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 …