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Study of the effects of solvent and temperature on the self-assemble surface patterns in Azopolymer films

Abstract : In this thesis we present various patterns formed by self-organization of azopolymer materials subjected to light radiation. We have shown that many photoinduced surface gratings, up to 10, can be recorded on the same area of an azopolymer film, provided that the polarization of the writing beam is well chosen. This effect allowed the creation of a wide variety of complex patterns. In this thesis, we show such complex structures formed on the surface of thin layers of azopolymer, via a set of superimposed networks (up to 16 on the same zone). We thus create so-called quasi-crystal structures with 2 dimensions. The azopolymer surface is then used as a mold to be replicated with an elastomer. The elastomer layer produced has the same structure as the azopolymer mold. This layer is flexible, transparent and stretchable and we used it for the deposition of unique nano-objects. The characteristics of two photoinduced surfaces of two chiral azopolymers were compared: a Gaussian type random surface and a surface with quasi-random lattices. These patterns were obtained with a simple bottom-up technique, by illuminating the thin layer of azopolymer with a single laser beam. The surface with quasi-random lattices can be used for the coupling of light in several directions in an ultra-thin film. These two surfaces were used as molds and replicated on a transparent elastomer. They show a very good trapping of light. More precisely, the trapping of the light is 20% better with the quasi-random gratings than with the random surface of the Gaussian type and it is of the order of 40%.
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Shahla Sorkhabi. Study of the effects of solvent and temperature on the self-assemble surface patterns in Azopolymer films. Condensed Matter [cond-mat]. Université d'Angers, 2017. English. ⟨tel-01659717⟩

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