BACKGROUND Future high-performance portable and wearable optical devices and
systems with small footprints and low weights will require components with small form …

During the past few years, metasurfaces have been used to demonstrate optical elements
and systems with capabilities that surpass those of conventional diffractive optics. Here, we …

Thermal emission—the process through which all objects with a finite temperature radiate
electromagnetic energy—has generally been thought to obey reciprocity, where the …

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

Varifocal lenses, conventionally implemented by changing the axial distance between
multiple optical elements, have a wide range of applications in imaging and optical beam …

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 …

A meta‐lens is an advanced flat optical device composed of artificial antennas. The
amplitude, phase, and polarization of incident light can be engineered to satisfy the …

The ideal material for nanophotonic applications will have a large refractive index at optical
frequencies, respond to both the electric and magnetic fields of light, support large optical …

In this Letter, we demonstrate highly efficient, polarization-insensitive planar lenses
(metalenses) at red, green, and blue wavelengths (λ= 660, 532, and 405 nm). Metalenses …

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