Search results for "Microelectronics"

Quality factor control of Si-based two-dimensional photonic crystals with a Bragg mirror

2006

International audience

Nano-manipulation of confined electromagnetic fields with a near-field probe

2008

International audience

Far- and near-field characterization of a photonic-crystal-based microcavity on silicon-on-insulator

2004

International audience

Fabrication et usinage des guides en verre de tellurite pour l'optique non-linéaire intégrée

2021

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Fano-resonances in High Index Dielectric Nanowires for Directional Scattering

2018

High refractive index dielectric nanostructures provide original optical properties thanks to the occurrence of size- and shape-dependent optical resonance modes. These modes commonly present a spectral overlap of broad, low-order modes (\textit{e.g}. dipolar modes) and much narrower, higher-order modes. The latter are usually characterized by a rapidly varying frequency-dependent phase, which - in superposition with the lower order mode of approximately constant phase - leads to typical spectral features known as Fano resonances. Interestingly, such Fano resonances occur in dielectric nanostructures of the simplest shapes. In spheroidal nanoparticles, interference between broad magnetic di…

Oblique angle co-deposition of nanocolumnar tungsten thin films with two W sources: Effect of pressure and target current

2022

Two series of tungsten thin films are sputtered on silicon and glass substrates by oblique angle co-deposition technique with an original configuration. Two opposite distinct tungsten targets are simultaneously used, both tilted with an oblique angle of 80°. The growth is performed at low (0.33 Pa) and high (1.5 Pa) argon sputtering pressure and the current intensity applied to the targets varies between 50 and 250 mA. The effect of these deposition parameters on the films microstructure and electrical properties is investigated by scanning and transmission electron microscopy, X-ray diffraction and pole figures, and van der Pauw method. Due to self-shadowing effect, all tungsten sputtered …

Multicriteria optimization of 3D printed wing using PLA reinforced with carbon fiber

2021

The purpose of this work is the optimal conception of a wing built using fused deposition modeling (FDM),<br&gtwhich is one of the main additive manufacturing (AM) process. PLA reinforced with carbon fiber was selected for the<br&gtfilament as we have defined their mechanical properties in previous work. The optimization approach use hybrid strategy<br&gtbased on surface response method with kriging model and a heuristic method to avoid to be trapped in local<br&gtminimization/maximization. The objective functions for this optimization are the weight, the drag (functions to minimize)<br&gtand the lift (function to maximize) with respect to the failure criteria of the composite material used…

Ballistic and thermalized regimes to tune structure and conducting properties of W-Mo thin films

2022

Detection of Indoor Air Pollutants Using Reactive Sputtering/GLAD of Tin Oxide Thin Films

2021

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Guidance of surface elastic waves along a linear chain of pillars

2016

International audience; The propagation of surface elastic waves, or surface phonons, is considered along a linear and periodic chain of cylindrical pillars sitting on a semi-infinite solid substrate. A variety of guided modes, some of them exhibiting a very low group velocity, are shown to exist at frequencies close to the resonance frequencies of the pillars. Although the pillar diameter is typically smaller than half the relevant wavelength, lateral radiation on the surface is found to be canceled. Surface guidance is explained by the hybridization of the resonating pillars with the continuum of elastic waves of the substrate.