Control over the dispersion of the refractive index is essential to the performance of most
modern optical systems. These range from laboratory microscopes to optical fibres and even …

Applying intelligence algorithms to conceive nanoscale meta-devices becomes a flourishing
and extremely active scientific topic over the past few years. Inverse design of functional …

Metalenses consist of nanostructures that locally control the optical phase. They offer many
degrees of freedom for manipulating a wavefront, which gives a number of advantages over …

In recent years there has been a lot of interest in flat lenses, a category that includes
diffractive lenses and metalenses. These lenses have the potential of reducing the size and …

A lens performs an approximately one-to-one mapping from the object to the image plane.
This mapping in the image plane is maintained within a depth of field (or referred to as depth …

Traditional optical lenses and the corresponding imaging systems, which are based on the
optical paths when light propagates inside the bulky media, usually suffer from the bulky …

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 …

It is generally thought that correcting chromatic aberrations in imaging requires multiple
surfaces. Here, we show that by allowing the phase in the image plane of a flat lens to be a …

We experimentally demonstrate a∼ 1-mm-thick near infrared camera comprised of a multi-
level diffractive lens coupled with a conventional monochrome image sensor. We performed …

We designed and fabricated a flat multi-level diffractive lens (MDL) that is achromatic in the
SWIR band (875 nm to 1675 nm). The MDL had a focal length of 25 mm, aperture diameter …