In this Review, the theory and applications of optical micro‐and nano‐resonators are
presented from the underlying concept of their natural resonances, the so‐called quasi …

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

Metasurfaces are ultrathin optical elements that are highly promising for constructing
lightweight and compact optical systems. For their practical implementation, it is imperative …

Coherent upconversion of terahertz and mid-infrared signals into visible light opens new
horizons for spectroscopy, imaging, and sensing but represents a challenge for conventional …

The specificity of modal-expansion formalisms is their capabilities to model the physical
properties in the natural resonance-state basis of the system in question, leading to a …

All-optical modulation yields the promise of high-speed information processing. In this field,
metasurfaces are rapidly gaining traction as ultrathin multifunctional platforms for light …

Efficient frequency up-conversion of coherent light at the nanoscale is highly demanded for
a variety of modern photonic applications, but it remains challenging in nanophotonics …

Metallic nanostructures with nanometer gaps support hybrid plasmonic modes with an
extremely small mode volume and strong local field intensity, which constitutes an attractive …

Modern nanophotonics has witnessed the rise of “electric anapoles”(EDAs), destructive
interferences of electric and toroidal electric dipoles, actively exploited to resonantly …

Plasmon resonances at the surface of metallic antennas allow for extreme enhancement of
Raman scattering. Intrinsic to plasmonics, however, is that extreme field confinement lacks …