High refractive index in low metal content nanoplasmonic surfaces from self-assembled block copolymer thin films

Abstract : Materials with a high and tunable refractive index are attractive for nanophotonic applications. In this contribution, we propose a straightforward fabrication technique of high-refractive index surfaces based on self-assembled nanostructured block copolymer thin films. The selective and customizable metal incorporation within out-of-plane polymer lamellae produces azimuthally isotropic metallic nanostructures of defined geometries, which were analysed using microscopy and small-angle X-ray scattering techniques. Variable-angle spectroscopic ellipsometry was used to relate the geometrical parameters of the metallic features and the resulting refractive index of the patterned surfaces. In particular, nanostructured gold patterns with a high degree of homogeneity and a gold content as low as 16 vol% reach a refractive index value of more than 3 in the visible domain. Our study thus demonstrates a new route for the preparation of high refractive index surfaces with a low metal content for optical applications.
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Submitted on : Wednesday, November 28, 2018 - 3:06:23 PM
Last modification on : Saturday, May 4, 2019 - 1:08:58 AM

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Alberto Alvarez-Fernandez, Karim Aissou, Gilles Pécastaings, Georges Hadziioannou, Guillaume Fleury, et al.. High refractive index in low metal content nanoplasmonic surfaces from self-assembled block copolymer thin films. Nanoscale Advances, RSC, 2019, pp-849-857. ⟨10.1039/c8na00239h⟩. ⟨hal-01938227⟩

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