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 …

A key goal of metalens research is to achieve wavefront shaping of light using optical
elements with thicknesses on the order of the wavelength. Such miniaturization is expected …

In the wake of intense research on metamaterials the two-dimensional analogue, known as
metasurfaces, has attracted progressively increasing attention in recent years due to the …

Metasurfaces are nanostructured devices composed of arrays of subwavelength scatterers
(or meta-atoms) that manipulate the wavefront, polarization, or intensity of light. Like most …

As optical metasurfaces become progressively ubiquitous, the expectations from them are
becoming increasingly complex. The limited number of structural parameters in the …

Fourier optics, the principle of using Fourier transformation to understand the functionalities
of optical elements, lies at the heart of modern optics, and it has been widely applied to …

A metasurface lens (meta-lens) bends light using nanostructures on a flat surface.
Macroscopic meta-lenses (mm-to cm-scale diameter) have been quite difficult to simulate …

Photonic metasurface, a 2D array of plasmonic or dielectric optical meta-atoms, provides a
versatile and compact platform for manipulating the polarization, phase and amplitude of …

We report the first demonstration of a mid-IR reflection-based flat lens with high efficiency
and near diffraction-limited focusing. Focusing efficiency as high as 80%, in good agreement …