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- Title
Formation of a Grating of Submicron Nematic Layers by Photopolymerization of Nematic-Containing Mixtures.
- Authors
Caputo, R.; Sukhov, A. V.; Umeton, C.; Ushakov, R. F.
- Abstract
A submicron, spatially periodic, structure consisting of a sequence of oriented layers of a nematic liquid crystal (NLC), separated by isotropic polymeric walls, was obtained experimentally. This was accomplished by polymerization induced by the interference pattern of UV laser radiation in a NLC-containing prepolymer mixture. It was established that such a structure occurs when phase separation and nematic ordering are prevented during the polymerization process. These structures are the diffraction elements, whose efficiency is much greater than that of a standard grating of polymer-dispersed liquid crystals [1–4] which is obtained in the same initial mixture. Specifically, a diffraction efficiency of 60–70% was obtained for structures with the period Λ = 0.2μm, even in mixtures where a grating with Λ < 6μm cannot be obtained at all by the standard technique.
- Subjects
PHOTOPOLYMERIZATION; LASER beams; LIQUID crystals
- Publication
Journal of Experimental & Theoretical Physics, 2000, Vol 91, Issue 6, p1190
- ISSN
1063-7761
- Publication type
Article
- DOI
10.1134/1.1342885