121 citations · 339 across the 24 of their papers we have counts for
22 papers · 1 filter
Single-exposure holographic 3D printing via inverse-designed phase masks
Dajun Lin, Xiaofeng Chen, Connor O. Dea +8
Additive manufacturing using light is commonly constrained by serial voxel-by-voxel or layer-by-layer processing, which fundamentally limits fabrication speed and scalability. Here…
Four-dimensional video imaging via generative deep learning and a diffuser-encoded image sensor
Max T. Kauss, William Walker, Alexander Ingold +3
Light carries rich information across space, spectrum, polarization, and time, yet conventional cameras capture only a narrow projection of this multidimensional structure. A thin…
Visible to Longwave-infrared imaging via an inverse-designed monolithic lens
Syed N. Qadri, Apratim Majumder, John D. Hodges +3
Chromatic aberrations impose a fundamental barrier on optical design, confining most imaging systems to narrow spectral bands with fractional bandwidths typically limited to $Δλ/λ<…
Wavefront Coding for Accommodation-Invariant Near-Eye Displays
Ugur Akpinar, Erdem Sahin, Tina M. Hayward +3
We present a new computational near-eye display method that addresses the vergence-accommodation conflict problem in stereoscopic displays through accommodation-invariance. Our sys…
Contrary to widespread belief, the Fresnel zone plate outperforms the metalens at high NA
Apratim Majumder, John A. Doughty, Tina H. Hayward Henry I. Smith +1
Rigorous simulations challenge recent claims that metalenses outperform conventional diffractive lenses, such as Fresnel Zone Plates (FZPs), in focusing efficiency at high numerica…
Dynamic Spectral fluorescence microscopy via Event-based & CMOS image-sensor fusion
Richard G. Baird, Apratim Majumder, Rajesh Menon
We present a widefield fluorescence microscope that integrates an event-based image sensor (EBIS) with a CMOS image sensor (CIS) for ultra-fast microscopy with spectral distinction…
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…
FDTD-based Inverse Design enables f/0.27 flat Microlens Array for Integral Imaging
Tina M. Hayward, Robert Stewart, Rajesh Menon +1
We demonstrate a high-NA (0.88), ultra-low-f-number (f/0.2714), multi-wavelength (480nm, 550nm and 650nm) multilevel diffractive MicroLens Array (MLA) using inverse design. Each mi…
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…
Machine Learning enables Ultra-Compact Integrated Photonics through Silicon-Nanopattern Digital Metamaterials
Sourangsu Banerji, Apratim Majumder, Alex Hamrick +2
In this work, we demonstrate three ultra-compact integrated-photonics devices, which are designed via a machine-learning algorithm coupled with finite-difference time-domain (FDTD)…
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…
Nanophotonic Optical Switching Using Digital Metamaterials and Photochromism
Apratim Majumder, Mark Mondol, Trisha L. Andrew +1
Optical switches are one of the most important elements of integrated photonics. Here, we designed, fabricated and characterized several nanophotonic optical switches (NOSs) in sil…
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…