Polaritons are hybrid excitations of matter and photons. In recent years, polaritons in van der
Waals nanomaterials—known as van der Waals polaritons—have shown great promise to …

Interactions between light and matter play an instrumental role in spectroscopy, sensing,
quantum information processing and lasers. In most of these applications, light is considered …

Photonic metasurfaces, that is, two-dimensional arrangements of designed plasmonic or
dielectric resonant scatterers, have been established as a successful concept for controlling …

Evolving from metamaterials, optical metasurfaces not only inherit their unprecedented
flexibility in tailoring light–matter interaction but also the generally fixed response …

When impinging on optical structures or passing in their vicinity, free electrons can
spontaneously emit electromagnetic radiation, a phenomenon generally known as …

It is a long-standing goal to create light with unique quantum properties such as squeezing
and entanglement. We propose the generation of quantum light using free-electron …

Tunable sources of X-ray radiation are widely used for imaging and spectroscopy in
fundamental science, medicine and industry. The growing demand for highly tunable, high …

This paper reviews the-state-of-the-art of electromagnetic (EM) metasurfaces and emergent
applications in advanced integrated devices and instruments from the design method to …

Free-electron radiation results from the interaction between swift electrons and the local
electromagnetic environment. Recent advances in material technologies provide powerful …

Metamaterials are the major type of artificially engineered materials which exhibit naturally
unobtainable properties according to how their microarchitectures are engineered. Owing to …