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 …

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 …

Achromatic metalens composed of arrays of subwavelength nanostructures with spatially
varying geometries is attractive for a number of optical applications. However, the limited …

Extended depth of focus (EDOF) lenses are important for various applications in
computational imaging and microscopy. In addition to enabling novel functionalities, EDOF …

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 …

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 …

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 …

Multilevel diffractive lenses (MDLs) have emerged as an alternative to both conventional
diffractive optical elements (DOEs) and metalenses for applications ranging from imaging to …