In the late nineteenth century, Heinrich Hertz demonstrated that the electromagnetic
properties of materials are intimately related to their structure at the subwavelength scale by …

BACKGROUND Nanoscale optics is usually associated with plasmonic structures made of
metals such as gold or silver. However, plasmonics suffers from high losses of metals …

Metasurfaces are ushering in an era of multifunctional control over optical wavefronts
realized with ultrathin planarized devices. Recent advances have been enabling …

This article reviews recent progress leading to the realization of planar optical components
made of a single layer of phase shifting nanostructures. After introducing the principles of …

We show that silicon-based metagratings capable of large-angle, multifunctional
performance can be realized using inverse freeform design. These devices consist of …

Resonant waveguide gratings (RWGs), also known as guided mode resonant (GMR)
gratings or waveguide‐mode resonant gratings, are dielectric structures where these …

The original Kerker effect was introduced for a hypothetical magnetic sphere, and initially it
did not attract much attention due to a lack of magnetic materials required. Rejuvenated by …

The so‐called 'flat optics' that shape the amplitude and phase of light with high spatial
resolution are presently receiving considerable attention. Numerous journal publications …

An optical design space that can highly benefit from the recent developments in
metasurfaces is the folded optics architecture where light is confined between reflective …

The refractive-lens technique has been well developed over a long period of evolution,
offering powerful imaging functionalities, such as microscopes, telescopes, and …