A submicron, spatially periodic, structure consisting of a sequence of oriented layers of a ncmatic 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 ncmatic 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 A = 0.2 jam, even in mixtures where a grating with A < 6 |lm cannot be obtained at all by the standard technique.
Scheda prodotto non validato
Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo
|Titolo:||Formation of a Grating of Submicron Nematic Layers by Photopolymerization of Nematic-Containing Mixtures|
|Data di pubblicazione:||2000|
|Citazione:||Formation of a Grating of Submicron Nematic Layers by Photopolymerization of Nematic-Containing Mixtures / Caputo, Roberto; Sukhov, A. V.; Umeton, Cesare Paolo; Ushakov, R. F.. - In: JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS. - ISSN 1063-7761. - 91:6(2000), pp. 1190-1197.|
|Appare nelle tipologie:||1.1 Articolo in rivista|