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

Flat lenses, including metalens and diffractive lens, have attracted increasing attention due
to their ability to miniaturize the imaging devices. However, realizing a large scale …

Flat optics consisting of nanostructures of high–refractive index materials produce lenses
with thin form factors that tend to operate only at specific wavelengths. Recent attempts to …

It is generally assumed that correcting chromatic aberrations in imaging requires multiple
optical elements. Here, we show that by allowing the phase in the image plane to be a free …

Diffractive lenses can be very thin and light. They usually suffer from chromatic aberration
and work only over a narrow range of wavelengths but so-called achromatic diffractive …

Abstract Direct Write Laser (DWL) Grayscale (GS) lithography has gathered attention as a
versatile technological solution to fabricate arbitrary and complex 2.5 D structures in …

Diffractive lenses can replicate the optical functions of their refractive counterparts using an
equivalent surface relief phase profile, enabling more compact optical assemblies and …

Metasurfaces have attracted much attention due to their great ability to manipulate the
electromagnetic field over an ultra-compact profile, which facilities the realization of the next …

We utilized inverse design to engineer the point-spread function (PSF) of a low-f-number,
freeform diffractive microlens in an array, so as to enable extended depth of focus (DOF) …

Compared with conventional lenses, metalenses can offer smaller form factor, light weight
and new functionality, and have become the focus of the recent investigations of …