Assessing the production process of holographic nanoparticle-polymer composite gratings using polarized SANS
We use materials that are sensitive to light and apply holographic techniques to develop diffraction gratings for light as well as for long-wavelength neutron optics. These nanoparticle-polymer composite gratings consist of mixtures of monomers, photostarter and particular species of nanoparticles. Under illumination with a periodic light intensity pattern, the raw materials exhibit a periodic refractive-index pattern arising from a light-induced redistribution of the constituents. In this process, monomers are drawn into bright regions where they are consumed by the polymerization initiated by the illuminated photostarter chemical. The resulting chemical potential gradient draws nanoparticles to the dark regions. A hologram of the periodic light pattern is recorded, which is a nearly sinusoidal density modulation pattern with typical period of some 100 nm. Our goal is to optimize the already elaborate production process by obtaining better understanding of its details. In particular, the experiment described in this proposal aims at testing the efficiency of the nanoparticle redistribution by holographic methods using polarized SANS.
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KLEPP Juergen; CUBITT Robert; FALLY Martin and PRUNER Christian. (2019). Assessing the production process of holographic nanoparticle-polymer composite gratings using polarized SANS. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-559
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