121 citations · 413 across the 15 of their papers we have counts for
17 papers · 1 filter
HD snapshot diffractive spectral imaging and inferencing
Apratim Majumder, Monjurul Meem, Fernando Gonzalez del Cueto +4
We present a novel high-definition (HD) snapshot diffractive spectral imaging system utilizing a diffractive filter array (DFA) to capture a single image that encodes both spatial…
Circumventing size-bandwidth limits in imaging with flat lenses
Apratim Majumder, Monjurul Meem, Nicole Brimhall +1
Recent theoretical work suggested upper bounds on the operating bandwidths of flat lenses. Here, we show how these bounds can be circumvented via a multi-level diffractive lens (MD…
Monolithic all-Silicon Flat lens for broadband LWIR Imaging
Orrin Kigner, Monjurul Meem, Brian Baker +4
We designed, fabricated and characterized a flat multi-level diffractive lens (MDL) comprised of only silicon with diameter = 15.2mm, focal length of 19mm, and operating over the l…
Super-resolution imaging with an achromatic multi-level diffractive microlens array
Sourangsu Banerji, Monjurul Meem, Apratim Majumder +2
Compound eyes found in insects provide intriguing sources of biological inspiration for miniaturized imaging systems. Inspired by such insect eye structures, we demonstrate an ultr…
Free-form broadband flat lenses for visible imaging
Monjurul Meem, Apratim Majumder, Rajesh Menon
In the absence of separate apertures, the size and focal length of a lens determines both its resolution and light-collection ability defined by numerical-aperture (NA) and f/#, re…
Inverse-designed flat lens for imaging in the visible & near-infrared with diameter > 3mm and NA=0.3
Monjurul Meem, Sourangsu Banerji, Apratim Majumder +4
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…
Large-area, high-NA Multi-level Diffractive Lens via inverse design
Monjurul Meem, Sourangsu Banerji, Christian Pies +3
Flat lenses enable thinner, lighter, and simpler imaging systems. However, large-area and high-NA flat lenses have been elusive due to computational and fabrication challenges. Her…
Imaging from the Visible to the Longwave Infrared wavelengths via an inverse-designed flat lens
Monjurul Meem, Sourangsu Banerji, Apratim Majumder +4
It is generally assumed that correcting chromatic aberrations in imaging requires optical elements. Here, we show that by allowing the phase in the image plane to be a free paramet…
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…
Non-diffracting broadband incoherent space-time fields
Murat Yessenov, Basanta Bhaduri, H. Esat Kondakci +3
Space-time (ST) wave packets are coherent pulsed beams that propagate diffraction-free and dispersion-free by virtue of tight correlations introduced between their spatial and temp…
Broadband space-time wave packets propagating 70 m
Basanta Bhaduri, Murat Yessenov, Danielle Reyes +6
The propagation distance of a pulsed beam in free space is ultimately limited by diffraction and space-time coupling. "Space-time" (ST) wave packets are pulsed beams endowed with t…
Multi-plane, Multi-band image projection via Broadband Diffractive Optics
Monjurul Meem, Apratim Majumder, Rajesh Menon
We demonstrate visible and near-IR image projection via non-absorbing, multi-level Broadband Diffractive-Optical Elements (BDOEs) in 1 or more planes. By appropriate design of the…
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…
Broadband imaging with one planar diffractive lens
Nabil Mohammad, Monjurul Meem, Bing Shen +1
We demonstrate imaging over the visible band using a single planar diffractive lens. This is enabled via multi-level diffractive optics that is designed to focus over a broad wavel…