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Synthesis and design of optical nanoresonators for the visible wavelengths

Abstract : Over the last decade, the field of self-assembled metamaterials exhibiting unusual properties such as a magnetic response in the visible range represents a challenging and attracting area. Many simulations reported that a dense arrangement of specific plasmonic sub-units called “meta-atoms”, may lead to a material with a negative refractive index. It was reported by computational modelling that a dodecapod clusters made of a central dielectric core and surrounded by a controlled number of satellites (12 satellites, here) with a specific size can exhibited some interesting properties. Here, the purpose was to fabricate such clusters from colloidal particles, which are perfectly symmetrical, made of a silica core and 12 polystyrene nodules. Subsequently, those polystyrene nodules can be dissolved to get silica particles with a specific number of “patches” or “dimples”. Those objects were synthesized in a large quantity. We were able to make those dimples sticky to tiny gold seed of 2-3 nm size and to grow then for a specific size. Optical measurements reported the strong magnetic coupling in-between the plasmonic nanoparticles around the dielectric core. We also reported that growing silver on tiny gold seeds generates stronger magnetic responses than those observed from gold clusters.
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https://tel.archives-ouvertes.fr/tel-02968585
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Submitted on : Friday, October 16, 2020 - 1:01:16 AM
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MANY_VERONIQUE_2018.pdf
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  • HAL Id : tel-02968585, version 1

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Véronique Many. Synthesis and design of optical nanoresonators for the visible wavelengths. Material chemistry. Université de Bordeaux, 2018. English. ⟨NNT : 2018BORD0325⟩. ⟨tel-02968585⟩

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