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Hybridization of block copolymer thin films with plasmonic nanoresonators for optical metamaterials design.

Abstract : The concept of metamaterials appeared in the years 2000 with the achievement of artificial structures enabling nonconventional propagation of electromagnetic waves. The electromagnetic response of metamaterials is based on the presence of optically resonant elements of sub-wavelength size and well-designed morphology and organization.In order to create controlled geometrical structures inherent to metamaterials design, block copolymer self-assembly constitutes an emerging strategy. Indeed, the periodic structures inherent to their segregation behavior can be used as scaffolds to create various regular or ordered nanoparticles arrays. The main objectives of this study is to demonstrate that block copolymer can indeed lead to a high level of control of a variety of designed nanostructures, in an easy and scalable method, and to correlate the structural parameters of the nanoparticles arrays and their optical properties.As a first demonstration, a lamellar-forming (poly(styrene)-block-poly(2-vinylpyridine) was used to create high refractive index surfaces. The selective and customizable metal incorporation within the out-of-plane lamellae produces azimuthally isotropic metallic nanostructures of defined geometries, for which a clear relationship between the gold content and the refractive index was established. Further studies were dedicated to the correlation between the geometrical parameters of the nanoparticles arrays and the optical properties through the macromolecular engineering of a series of cylinder-forming block copolymers having a wide range of molecular weights. Through this strategy, the particle diameter and the inter-particle distance were tuned leading to the production of metasurfaces with various optical characteristics. More complex metasurface designs were also obtained using a layer-by-layer self-assembly strategy, i.e. bimetallic raspberry nanoclusters or layered hybrid (metallic/polymer) structures. In all cases, the nanoparticles arrays were thoroughly analyzed using microscopy and small-angle X-ray scattering techniques in order to better apprehend the optical properties derived from variable-angle spectroscopic ellipsometry analysis.
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https://tel.archives-ouvertes.fr/tel-01958975
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Submitted on : Tuesday, December 18, 2018 - 1:24:06 PM
Last modification on : Tuesday, May 26, 2020 - 3:10:54 AM
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Alberto Alvarez Fernández. Hybridization of block copolymer thin films with plasmonic nanoresonators for optical metamaterials design.. Polymers. Université de Bordeaux, 2018. English. ⟨NNT : 2018BORD0168⟩. ⟨tel-01958975⟩

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