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Tuning the chiroptical properties of Goldhelices through their nanostructure optimization and hierarchical organization

Abstract : Chiral materials can have strong influence on the propagation of light and have attracted attention in the nano-science community. Gold nanoparticles (GNPs), stable plasmonic materials in the visible range (400-800 nm), are attractive objects as building blocks for optical materials. We have designed and obtained Goldhelices by grafting GNPs on silica nano-helical structures. The work presented in this thesis aims at developing tunable Goldhelices and organizing them in order to enhance, modify, reduce or even eliminate the chiroptical properties. The details of the nanostructures as well as the kinetics of formation of organic self-assembly which is used as templates for the formation of Goldhelices are fully studied. The hierarchical organization of the Goldhelices is investigated by the use of three techniques, the microfluidics, the dip-coating and the grazing incident spraying. Finally, the effect of the organization on their optical properties are characterized by chiral spectroscopies and Mueller matrix polarization ellipsometry. We demonstrate that such a system can be used for the creation of linear or circular polarizer where such polarization is solely tunable by the organization of the Goldhelices.
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Submitted on : Tuesday, October 15, 2019 - 1:46:07 PM
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Jie Gao. Tuning the chiroptical properties of Goldhelices through their nanostructure optimization and hierarchical organization. Material chemistry. Université de Bordeaux, 2019. English. ⟨NNT : 2019BORD0138⟩. ⟨tel-02316523⟩

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