ELSAWY , Mahmoud

We present a full study of an improved nonlinear plasmonic slot waveguides (NPSWs) in which buffer linear dielectric layers are added between the Kerr type nonlinear dielectric core and the two semi-infinite metal regions. For TM polarized waves, the inclusion of these supplementary layers have two consequences. First, they reduced the overall...

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We study the main nonlinear solutions of plasmonic slot waveguides made from an anisotropic metamaterial core with a positive Kerr-type nonlinearity surrounded by two semi-infinite metal regions. First, we demonstrate that for a highly anisotropic diagonal elliptical core, the bifurcation threshold of the asymmetric mode is reduced from the...

We propose an improved version of the symmetric metal slot waveguides with a Kerr-type nonlinear di-electric core adding linear dielectric buffer layers between the metal regions and the core. Using a finite element method to compute the stationary nonlinear modes, we provide the full phase diagrams of its main TM modes as a function of total...

Two distinct models are developed to investigate the transverse magnetic stationary solutions propagating in one-dimensional anisotropic nonlinear plasmonic structures made from a Kerr-type nonlinear metamaterial core embedded between two semi-infinite metal claddings. The first model is semi-analytical, in which we assume that the anisotropic...

We use our vector Maxwell's nonlinear eigenmode solver tostudy the stationary solutions in 2D cross-section plasmonicslot waveguides with isotropic Kerr nonlinear codes andanisotropic Kerr nonlinear cores. First, for the isotropic case,we demonstrate that, even in the low-power regime, 1D stud-ies may not provide accurate and meaningful results...

Optical metasurfaces have become increasingly prevalent as key components for manipulating light properties. Nevertheless, the majority of these devices remain passive and lack the capability to adapt to changing environmental conditions. Here, we propose an innovative design approach using asymmetric Gires–Tournois resonators to achieve...

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Resonant metasurfaces are of paramount importance in addressing the growing demand for reduced thickness and complexity, while ensuring high optical efficiency. This becomes particularly crucial in overcoming fabrication challenges associated with high aspect ratio structures, thereby enabling seamless integration of metasurfaces with...

During the last decade, the field of metasurfaces has drawn significant attention due to the unprecedented control over the optical properties of light in a very short propagation distance with high resolution. These devices consist of nanostructures defined within a single layer of metal or dielectric materials. Recently, several optimization...

Resonant metasurfaces are of paramount importance in addressing the growing demand for reduced thickness and complexity, while ensuring high optical efficiency. This becomes particularly crucial in overcoming fabrication challenges associated with high aspect ratio structures, thereby enabling seamless integration of metasurfaces with...

In metasurface design, the use of look-up tables based on a local periodicity approximation have been tradi-tionally employed, but can result in sub-optimal designs due to lack of consideration of near-field couplingeffects, which are particularly important for resonant systems. This paper explores the benefits of taking intoaccount near-field...

In recent years, metasurfaces have emerged as promising components for reducing the size and complexity ofoptical imaging systems. Nevertheless, their incorporation into these systems remains a challenge due to thedifference between the numerical tools used in the design of conventional imaging systems (ray tracing) and thedesign of...

A novel computational methodology based on statistical learning multiobjective optimization is developed to optimize large-scale achromatic 3D metalenses in the visible regime. The optimized lens has a numerical aperture of 0.56 and an average focusing efficiency of 45%. The metasurface is a nanostructured interface with a subwavelength...

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In recent years, metasurfaces have emerged as revolutionary tools to manipulate the behavior of light at the nanoscale. These devices consist of nanostructures defined within a single layer of metal or dielectric materials, and they offer unprecedented control over the optical properties of light, leading to previously unattainable applications...

In this paper, we present an overview of our innovative computational methodology based on statistical learning optimization to optimize highly efficient and robust metasurface designs. We have optimized highly efficient single-and multi-functional devices. In addition, we have extended our multi-objective optimization to account for...

Nanostructuring of materials has paved the way for manipulating and enhancing light-matter interactions, thereby opening the door for the full control of these interactions at the nanoscale. In particular, the interaction of light waves (or more general optical waves) withmatter is a subject of rapidly increasing scientific importance and...

We report on our recent achievements on the development of a suite of innovative computational tools for the study of ligh-matter interactions at the nanoscale and in particular for the inverse design of nanophotonic devices. Our software suite, named DIOGENeS (https://diogenes.inria.fr/), is organized around high-order accurate finite element...

We report the experimental observation of plasmon-soliton waves. The demonstration isperformed in a chalcogenide-based four-layer planar geometry. It reveals a plasmon-enhanced Kerr selffocusingundergone by a TM polarized beam propagating inside the structure.

This poster emphasizes the paramount importance of employing optimization techniques to effectively address nonlocal resonance phenomena, accomplish multiobjective optimization, and seamlessly integrate uncertain quantification methods.