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<dc:title xml:lang="en">Spray-assisted alignment of layer-by-layer assembled silver nanowires for linear and chiral nanoplasmonics</dc:title>
<dcterms:alternative xml:lang="fr">Dépôt couche-par-couche de films minces de nanofils d'argent orientés par pulvérisation pour des applications en nanoplasmonique linéaire et chirale</dcterms:alternative>
<dc:subject xml:lang="fr">Alignement</dc:subject>
<dc:subject xml:lang="fr">Pulvérisation à incidence rasante</dc:subject>
<dc:subject xml:lang="fr">Nanofils d'argent</dc:subject>
<dc:subject xml:lang="fr">Assemblage couche-par-couche</dc:subject>
<dc:subject xml:lang="fr">Nanomatériaux orientés</dc:subject>
<dc:subject xml:lang="en">Alignment</dc:subject>
<dc:subject xml:lang="en">Grazing-incidence spraying</dc:subject>
<dc:subject xml:lang="en">Silver nanowires</dc:subject>
<dc:subject xml:lang="en">Layer-by-layer assembly</dc:subject>
<dc:subject xml:lang="en">Oriented nanomaterials</dc:subject>
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<tef:elementdEntree autoriteExterne="02963301X" autoriteSource="Sudoc">Couches monomoléculaires</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Ce travail de thèse décrit l’alignement par pulvérisation de nanofils d'argent (AgNWs) aux interfaces solides sous la forme de films mono- et multicouches. Cette technique permet de contrôler la densité de nanofils dans le plan sur des zones macroscopiques avec des paramètres d'ordre nématique atteignant des valeurs &gt; 0,90 dans les films monocouches. La répétition des cycles de dépôt en utilisant l’assemblage couche-par-couche produit des films multicouches dans lesquels par exemple des superstructures uniaxiales ou hélicoïdales peuvent être préparées en choisissant les directions de pulvérisation appropriées pour chaque monocouche individuelle. Les systèmes uniaxiaux sont des polariseurs fortement dépendant de la longueur d'onde (en raison de l'orthogonalité des plasmons transversaux et longitudinaux des AgNWs) et montrent une conductivité anisotrope dans le plan. Les systèmes hélicoïdaux montrent un dichroïsme circulaire très élevé qui peut être ajusté par exemple par le biais de la densité des AgNWs dans le plan ou de la distance entre les monocouches individuelles. Les mesures de la matrice Müller confirment que le dichroïsme circulaire observé découle de la superstructure hélicoïdale des multicouches à base d’AgNWs.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis work describes the spray-alignment of silver nanowires (AgNWs) at solid interfaces in the form of mono- and multilayer films. The technique allows to control the in-plane density of nanowires over macroscopic areas with the best nematic order parameters reaching &gt; 0.90 in monolayer films. Repeated deposition cycles using layer-by-layer assembly yield multilayer films in which for example uniaxial or helically twisted superstructures can be prepared by choosing appropriate spraying directions for each individual monolayer. Uniaxial systems are strong wavelength dependent polarizers (due to the orthogonality of the transversal and longitudinal plasmons of the AgNWs) and they show anisotropic in-plane conductivitiy. Helically twisted systems show very high circular dichroism which can be tuned for example through the in-plane density of AgNWs or through the distance between individual monolayers. Müller Matrix measurements confirm that the observed circular dichroism arises from the helically twisted superstructure of the AgNW multilayers.</dcterms:abstract>
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