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Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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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.