GENEVET , Patrice

In this thesis, I address the formation of localized structures in a semiconductor lasing system based on two mutually coupled microresonators, one playing the role of an amplifier while the second behaves as saturable absorber. I report on the generation and control of independent laser solitons which are bright intensity peaks over an...

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The Pancharatnam-Berry (PB) metasurfaces have been considered as the innovative optical devices for efficient manipulation of both the phase and the polarization of electromagnetic field. Here, we present the simultaneous generation of circularly-, elliptically-, and linearly-polarized states from a single linearly-polarized incident beam by...

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...

The Pancharatnam-Berry (PB) metasurfaces have been considered as the innovative optical devices for efficient manipulation of both the phase and the polarization of electromagnetic field. Here, we present the simultaneous generation of circularly-, elliptically-, and linearly-polarized states by a simplest PB metassurface with one-dimensional...

Beyond the chirality of light associated to polarization or spin, light beams can carry an additional orbital angular momentum due to the helicoidal structure of their phase front. This property, if combined with light localization could give rise to localized optical vortices, whose existence in nonlinear and dissipative optical systems is...

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We report on experimental observation of localized structures in two mutually coupled broad-area semiconductor resonators. These structures coexist with a dark homogeneous background and they have the same properties as cavity solitons without requiring the presence of a driving beam into the system. They can be switched individually on and off...

This is an introduction to the special issue "Inverse Design of nanophotonics devices and materials" in the journal "Photonics and Nanostructures: Fundamentals and Applications" which aims at providing a concise overview of the most recent developments in this field.

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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Scattering of anisotropic nanostructures has always been a challenging problem due to the complexity of the boundary conditions with the tensorial form of the permittivity, which is becoming even more challenging for non-conventional geometries. To solve these problems, it is necessary to consider strong hypothesis of lossless material and...

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...

Rapid developments in the emerging field of stretchable and conformable photonics necessitate analytical expressions for boundary conditions at metasurfaces of arbitrary geometries. Here, we introduce the concept of conformal boundary optics: a design theory that determines the optical response for designer input and output fields at such...

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Resonant scattering, guided mode propagation phase and/or orientation-dependent phase retardations are the three main mechanisms used until now to conceive optical metasurfaces.

In this Perspective, we discuss the different opportunities offered by time-modulated metasurfaces for dynamic wavefront engineering and space-time photonics. Efforts in codesigning a photonic response while taking into careful consideration the switching/tuning mechanisms, including thermal, electronic, optical, chemical, and mechanical...

In this contribution, we use two different efficient global optimization techniques in order to optimize 3D real life gradient metasurface based on GaN semiconductor. Our results show that we can achieve more than 87% of diffrac-tion efficiency at the visible regime using only 150 solver calls for optimizing 12 parameters. Our methods seem to...

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.

Optical metasurface, composed of ultra-thin subwavelength meta-atoms, has enabled flatoptics and corresponding flat optical components such as ultra-thin lenses, color filters and absorbers. Among the plethora of applications currently attracting great interest, next generation display techniques could further benefit from metasurface...