220 citations · 812 across the 25 of their papers we have counts for
27 papers
Reconfigurable Curved Beams at Terahertz Frequencies Using Inverse-Designed Bilayer Diffractive Structures
Wei Jia, Miguel Gomez, Steve Blair +1
Curved electromagnetic beams at terahertz (THz) frequencies have recently emerged as a powerful example of wavefront engineering, with applications in imaging and high-capacity wir…
Holographic Mapping of Orbital Angular Momentum Using a Terahertz Diffractive Optical Neural Network
Wei Jia, Miguel Gomez, Steve Blair +1
Using orbital angular momentum (OAM) in the terahertz (THz) range provides a new degree of freedom for communication and imaging systems. This study presents a compact diffractive…
Control of Extraordinary Optical Transmission in Resonant Terahertz Gratings via Lateral Depletion in an AlGaN-GaN Heterostructure
Geofrey Nyabere, Hunter Ellis, Miguel Gomez +7
Periodic metallic gratings on substrates can support a range of electromagnetic modes, such as leaky waveguide, guided-resonant, and Fabry-Perot (FP) cavity modes, which can strong…
Inconsistencies of metalens performance and comparison with conventional diffractive optics
Rajesh Menon, Berardi Sensale-Rodriguez
We posit that inconsistent interpretations of experimental data have led to inaccurate claims on metalens focusing efficiencies. By performing a meta-analysis,we show that extraord…
LightRidge: An End-to-end Agile Design Framework for Diffractive Optical Neural Networks
Yingjie Li, Ruiyang Chen, Minhan Lou +3
To lower the barrier to diffractive optical neural networks (DONNs) design, exploration, and deployment, we propose LightRidge, the first end-to-end optical ML compilation framewor…
Broken Symmetry Effects due to Polarization on Resonant Tunneling Transport in Double-Barrier Nitride Heterostructures
Jimy Encomendero, Vladimir Protasenko, Berardi Sensale-Rodriguez +4
The phenomenon of resonant tunneling transport through polar double-barrier heterostructures is systematically investigated using a combined experimental and theoretical approach.…
Enhancing the Electron Mobility in Si-doped (010) -GaO films with Low-Temperature Buffer Layers
Arkka Bhattacharyya, Carl Peterson, Takeki Itoh +6
We demonstrate a new substrate cleaning and buffer growth scheme in -GaO epitaxial thin films using metalorganic vapor phase epitaxy (MOVPE). For the channel structure,…
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…
Two-coil Wireless Power Transfer System Configured in Series-Series Topology: Fundamental Dynamics and Limitations on Transmitted Power
Binh Duc Truong, Thuy Thi-Thien Le, Berardi Sensale-Rodriguez
The dynamics and performance of a two-coil resonant coupled wireless power transfer system are investigated. At high coupling, the frequency-splitting phenomenon occurs, in which t…
Inverse Designed THz Spectral Splitters
Sourangsu Banerji, Yu Shi, Vivian Song-En Su +5
This letter reports proof-of-principle demonstration of 3D printable, low-cost, and compact THz spectral splitters based on diffractive optical elements (DOEs) designed to disperse…
The anisotropic quasi-static permittivity of single-crystal beta-Ga2O3
Prashanth Gopalan, Sean Knight, Ashish Chanana +11
The quasi-static anisotropic permittivity parameters of electrically insulating gallium oxide (beta-Ga2O3) were determined by terahertz spectroscopy. Polarization-resolved frequenc…
Role of Fabrication Errors and Refractive Index on Multilevel Diffractive Lens Performance
Sourangsu Banerji, Jacqueline Cooke, Berardi Sensale-Rodriguez
Multilevel diffractive lenses (MDLs) have emerged as an alternative to both conventional diffractive optical elements (DOEs) and metalenses for applications ranging from imaging to…
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…
An inverse designed achromatic flat lens operating in the ultraviolet
Sourangsu Banerji, Berardi Sensale Rodriguez
We demonstrate an inverse designed achromatic, flat, polarization-insensitive diffractive optic element, i.e., multilevel diffractive lens (MDL), operating across a broadband range…
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…
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…
Manifestation of kinetic-inductance in spectrally-narrow terahertz plasmon resonances in thin-film Cd3As2
Ashish Chanana, Neda Loftizadeh, Hugo O. Condori Quispe +7
Three-dimensional (3D) semimetals have been predicted and demonstrated to have a wide variety of interesting properties associated with its linear energy dispersion. In analogy to…
Terahertz spectroscopy of an electron-hole bilayer system in AlN/GaN/AlN quantum wells
H. Condori Quispe, S. M. Islam, S. Bader +7
We describe studies on the nanoscale transport dynamics of carriers in strained AlN/GaN/AlN quantum wells: an electron-hole bilayer charge system with large difference in transport…