Search results for "Nanotechnologie"
showing 10 items of 211 documents
Near-field observation of surface plasmon polariton propagation on thin metal stripes
2001
International audience; We use a photon scanning tunneling microscope to probe the field of surface plasmon polariton modes excited on finite-width thin metal films (metal stripes). We first investigate the coupling between surface plasmons launched by a focused beam on a homogeneous thin film and the modes sustained by metal stripes of different widths. We show that. if the width of the metal stripe is about a few micrometers, a strong coupling with the stripe modes can be achieved at visible frequencies. A sharp transverse confinement of the field associated with the surface plasmon modes propagating on the metal stripe is unambiguously observed on the constant height photon scanning tunn…
Dielectric-loaded surface plasmon-polariton waveguides at telecommunication wavelengths: Excitation and characterization
2008
International audience; The excitation and propagation of strongly confined surface plasmon-polariton (SPP) waveguide modes, supported by 500-nm-wide and 550-nm-high dielectric ridges fabricated on smooth gold films, are investigated at telecommunication wavelengths using a scanning near-field optical microscope. Different tapering structures for coupling of SPPs, excited at bare gold surfaces, into dielectric-loaded SPP waveguide (DLSPPW) modes are considered. The DLSPPW mode confinement and propagation loss are characterized. The DLSPPW mode propagation along an S bend having the smallest curvature radius of 2.48 mu m is shown, demonstrating the potential of DLSPPW technology for the real…
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>which is one of the main additive manufacturing (AM) process. PLA reinforced with carbon fiber was selected for the<br>filament as we have defined their mechanical properties in previous work. The optimization approach use hybrid strategy<br>based on surface response method with kriging model and a heuristic method to avoid to be trapped in local<br>minimization/maximization. The objective functions for this optimization are the weight, the drag (functions to minimize)<br>and the lift (function to maximize) with respect to the failure criteria of the composite material used…