41 citations · 170 across the 14 of their papers we have counts for
5 papers · 1 filter
Diffractive flat lens enables Extreme Depth-of-focus Imaging
Sourangsu Banerji, Monjurul Meem, Apratim Majumder +2
A lens performs an approximately one-to-one mapping from the object to the image planes. This mapping in the image plane is maintained within a depth of field (or referred to as de…
Imaging across the Short-Wave Infra-Red (SWIR) Band via a Flat Multilevel Diffractive Lens
Monjurul Meem, Sourangsu Banerji, Apratim Majumder +3
We designed and fabricated a flat multi-level diffractive lens (MDL) that is achromatic in the SWIR band (875nm to 1675nm). The MDL had a focal length of 25mm, aperture diameter of…
Imaging over an unlimited bandwidth with a single diffractive surface
Sourangsu Banerji, Monjurul Meem, Apratim Majumder +2
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 b…
Broadband lightweight flat lenses for longwave-infrared imaging
Monjurul Meem, Sourangsu Banerji, Apratim Majumder +3
We experimentally demonstrate imaging in the longwave-infrared (LWIR) spectral band (8um to 12um) using a single polymer flat lens based upon multi-level diffractive optics. The de…
Imaging with flat optics: metalenses or diffractive lenses?
Sourangsu Banerji, Monjurul Meem, Berardi Sensale-Rodriguez +1
Recently, there has been an explosion of interest in metalenses for imaging. The interest is primarily based on their sub-wavelength thicknesses. Diffractive lenses have been used…