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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including those from the School of Psychological Sciences & Health - but also papers by researchers based within the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

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A new kind of photo-polymerisation induced diffraction gratings in liquid crystalline composite materials

Caputo, R. and Sukhov, A.V. and Tabiryan, N.V. and Umeton, C and Ushakov, R.F. (2001) A new kind of photo-polymerisation induced diffraction gratings in liquid crystalline composite materials. Molecular Crystals and Liquid Crystals, 372 (1). pp. 263-274. ISSN 1542-1406

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Abstract

In this paper we report on the first results of a new technique used to obtain good quality holographic diffraction gratings. This technique represents an improvement with respect to the traditional one, the so called polymerisation induced phase separation technique. Gratings are obtained by exposing the initial homogeneous mixture of liquid crystal and monomer molecules to the pattern produced by two interfering UV laser beams. The polymerisation process, which is photo-induced by this pattern, is thus spatially inhomogeneous: It leads to a redistribution of the mixture components and hence to the grating formation.