Uriel Levy
YOU?
Author Swipe
View article: High‐Numerical‐Aperture, 3D‐Printed All‐Dielectric Harmonic Diffraction Metalens in the Sub‐THz Frequency Range
High‐Numerical‐Aperture, 3D‐Printed All‐Dielectric Harmonic Diffraction Metalens in the Sub‐THz Frequency Range Open
Terahertz (THz) optical devices have emerged as critical tools across diverse applications, owing to the distinctive properties of THz radiation. The ability of THz waves to penetrate nonconductive materials enables numerous nondestructive…
View article: Tailored Frequency Conversion in Nonlinear Subwavelength Grating Metaslabs
Tailored Frequency Conversion in Nonlinear Subwavelength Grating Metaslabs Open
The use of metaslab waveguides consisting of subwavelength gratings (SWGs) is proposed as a highly flexible approach to obtain phase‐matched frequency conversion in nonlinear integrated devices. Control over the phase matching (PM) conditi…
View article: Nonlocality in photonic materials and metamaterials: roadmap
Nonlocality in photonic materials and metamaterials: roadmap Open
Photonic technologies continue to drive the quest for new optical materials with unprecedented responses. A major frontier in this field is the exploration of nonlocal (spatially dispersive) materials, going beyond the local, wavevector-in…
View article: Nature Inspired Design Methodology for a Wide Field of View Achromatic Metalens
Nature Inspired Design Methodology for a Wide Field of View Achromatic Metalens Open
Metalenses have become ubiquitous in academic research and have begun to make their transition to industry. However, chromatic aberration still greatly limits the applications of metalenses. Achieving a wide field-of-view (FOV) is another …
View article: Amplitude and Phase Imaging of CW-THz Waves Using a Photomixing System with Coherent Detection
Amplitude and Phase Imaging of CW-THz Waves Using a Photomixing System with Coherent Detection Open
Continuous-Wave Terahertz (CW-THz) phase and amplitude imaging provides valuable insights into the interaction between THz waves and matter, particularly in low-absorption materials. This information is also essential for enhancing CW-THz …
View article: Tunable transmissive metasurface based on thin-film lithium niobate
Tunable transmissive metasurface based on thin-film lithium niobate Open
Active metasurfaces hold great promise for spatial light modulation, and electro-optic tuning using lithium niobate is particularly attractive due to its high transparency and well-established thin-film platform. In this work, we present a…
View article: Silicon rich nitride: a platform for controllable structural colors
Silicon rich nitride: a platform for controllable structural colors Open
High refractive index dielectric materials like silicon rich nitride (SRN) are critical for constructing advanced dielectric metasurfaces but are limited by transparency and complementary metal oxide semiconductor (CMOS) process compatibil…
View article: Faraday-Ramsey rotation measurement in a thin cell as an analogy to an atomic beam
Faraday-Ramsey rotation measurement in a thin cell as an analogy to an atomic beam Open
Atomic beams offer measurement capabilities for hot vapors but often require complex, bulky systems, limiting miniaturization. This study explores hot vapors in thin cells (L=30,5 μm) as a simplified analogy to atomic beams. Coherence is m…
View article: Faraday-Ramsey rotation measurement in a thin cell as an analogy to an atomic beam
Faraday-Ramsey rotation measurement in a thin cell as an analogy to an atomic beam Open
Atomic beams offer measurement capabilities for hot vapors but often require complex, bulky systems, limiting miniaturization. This study explores hot vapors in thin cells (L=30,5 μm) as a simplified analogy to atomic beams. Coherence is m…
View article: Faraday-Ramsey rotation measurement in a thin cell as an analogy to an atomic beam
Faraday-Ramsey rotation measurement in a thin cell as an analogy to an atomic beam Open
Atomic beams are powerful tools for measuring spin coherence in hot vapors but require bulky setups, limiting device miniaturization. We demonstrate that micron-thin vapor cells can mimic atomic beam behavior by exploiting geometry-depende…
View article: Roadmap for Optical Metasurfaces
Roadmap for Optical Metasurfaces Open
Metasurfaces have recently risen to prominence in optical research, providing unique functionalities that can be used for imaging, beam forming, holography, polarimetry, and many more, while keeping device dimensions small. Despite the fac…
View article: hBN‐Encapsulated Graphene Coupled to a Plasmonic Metasurface via 1D Electrodes for Photodetection Applications
hBN‐Encapsulated Graphene Coupled to a Plasmonic Metasurface via 1D Electrodes for Photodetection Applications Open
It is shown here how encapsulated graphene devices can be laterally coupled to plasmonic metasurfaces via 1D edge contacts, preserving the high mobility of encapsulated graphene while enhancing optical coupling. The device is used for phot…
View article: High-Q and high finesse silicon microring resonator
High-Q and high finesse silicon microring resonator Open
We demonstrate the design, fabrication, and experimental characterization of a single transverse mode adiabatic microring resonator (MRR) implemented using the silicon-on- insulator (SOI) platform using local oxidation of silicon (LOCOS) a…
View article: Achromatic Imaging Systems with Flat Lenses Enabled by Deep Learning
Achromatic Imaging Systems with Flat Lenses Enabled by Deep Learning Open
Motivated by their great potential to reduce the size, cost, and weight, flat lenses, a category that includes diffractive lenses and metalenses, are rapidly emerging as key components with the potential to replace the traditional refracti…
View article: Silicon Rich Nitride Huygens Metasurfaces in the Visible Regime
Silicon Rich Nitride Huygens Metasurfaces in the Visible Regime Open
In recent years there has been a shift of interest in the Nanophotonics community moving from using metallic/plasmonic materials to using high‐index dielectric materials for the construction of metasurfaces. Although high‐index dielectrics…
View article: Achromatic imaging systems with flat lenses enabled by deep learning
Achromatic imaging systems with flat lenses enabled by deep learning Open
Motivated by their great potential to reduce the size, cost and weight, flat lenses, a category that includes diffractive lenses and metalenses, are rapidly emerging as key components with the potential to replace the traditional refractiv…
View article: Simulation of laser-induced tunnel ionization based on a curved waveguide
Simulation of laser-induced tunnel ionization based on a curved waveguide Open
The problem of tunneling ionization and the associated questions of how long it takes for an electron to tunnel through the barrier, and what the tunneling rate has fascinated scientists for almost a century. In strong field physics, tunne…
View article: CMOS-compatible electro-optical SRAM cavity device based on negative differential resistance
CMOS-compatible electro-optical SRAM cavity device based on negative differential resistance Open
The impending collapse of Moore-like growth of computational power has spurred the development of alternative computing architectures, such as optical or electro-optical computing. However, many of the current demonstrations in literature …
View article: On-chip multivariant COVID 19 photonic sensor based on silicon nitride double-microring resonators
On-chip multivariant COVID 19 photonic sensor based on silicon nitride double-microring resonators Open
Coronavirus disease 2019 (COVID-19) is a newly emerging human infectious disease that continues to develop new variants. A crucial step in the quest to reduce the infection is the development of rapid and reliable virus detectors. Here, we…
View article: Quasi-guided modes resulting from the band folding effect in a photonic crystal slab for enhanced interactions of matters with free-space radiations
Quasi-guided modes resulting from the band folding effect in a photonic crystal slab for enhanced interactions of matters with free-space radiations Open
We elucidate that guided modes supported by a regular photonic crystal slab structure composed of a square lattice of air holes in a silicon slab will transition into quasi-guided (leaky) modes when the radius of every second column of air…
View article: Inversionless gain in a lossy medium
Inversionless gain in a lossy medium Open
We study gain without inversion due to coherence effects in a Doppler-broadened degenerate three-level system of a rubidium-hydrogen mixture in a miniaturized micron scale custom vapor cell. The cell miniaturization gives rise to collision…
View article: Magnetic-field-independent spin-exchange relaxation-free magnetometer
Magnetic-field-independent spin-exchange relaxation-free magnetometer Open
SERF magnetometers based on dense ensembles of alkali-metal spins are precision quantum sensors that hold the record of measured and projected sensitivity to magnetic fields, in the $μ\textrm{G}-\textrm{mG}$ range. At geomagnetic fields ho…
View article: Suppressing the Decoherence of Alkali-Metal Spins at Low Magnetic Fields
Suppressing the Decoherence of Alkali-Metal Spins at Low Magnetic Fields Open
Interactions of electron spins with rotational degrees of freedom during collisions or with external fields are fundamental processes that limit the coherence time of spin gases. We experimentally study the decoherence of hot cesium spins …
View article: Waveguide-integrated mid-IR photodetector and all-optical modulator based on interlayer excitons absorption in a WS<sub>2</sub>/HfS<sub>2</sub> heterostructure
Waveguide-integrated mid-IR photodetector and all-optical modulator based on interlayer excitons absorption in a WS<sub>2</sub>/HfS<sub>2</sub> heterostructure Open
Novel 2D van der Waals semiconductors facilitate the formation of heterostructures and thus support bandgap engineering for atomically thin modern photonic applications. When these heterostructures form a type II band structure, interlayer…
View article: Strong coupling between quasi-bound states in the continuum and molecular vibrations in the mid-infrared
Strong coupling between quasi-bound states in the continuum and molecular vibrations in the mid-infrared Open
Strong light–matter coupling is of much interest for both fundamental research and technological applications. The recently studied bound state in the continuum (BIC) phenomenon in photonics with controlled radiation loss rate significantl…
View article: Generalized metric for broadband flat lens performance comparison
Generalized metric for broadband flat lens performance comparison Open
A plethora of metalenses and diffractive lenses (“flat lenses”) have been demonstrated over the years. Recently, attempts have been made to stretch their performance envelope, particularly in the direction of wide-band achromatic performan…