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Proceedings Paper

Multi-colour switching of polymer stabilized chiral nematic liquid crystal devices
Author(s): Jing Chen; Stephen M. Morris; Timothy D. Wilkinson; Harry J. Coles
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Paper Abstract

We have fabricated a series of polymer stabilized chiral nematic test cells for use as flexoelectro-optic devices. The devices fabricated were based on commercial chiral nematic mixtures which were polymer stabilized so as to enhance the uniformity and stability of the uniform lying helix texture in the cells. During fabrication and test procedures a series of unusual scattering states have been observed within the devices at different viewing angles. The observations made so far indicate that the properties of the scattering state lies somewhere between the focal conic texture and the Grandjean or planar texture and that the devices exhibit both a helical pitch selective reflection and scattering effect. What is even more dramatic is that the wavelength selectivity of the scattering effect can be tuned by an applied field. In addition, we show that it is possible to achieve good uniform lying helix textures from such devices. Moreover, we show that in certain cases the spontaneous alignment of the helix in the plane of the device opens up the possibility of a new mode of switching.

Paper Details

Date Published: 9 May 2007
PDF: 9 pages
Proc. SPIE 6587, Liquid Crystals and Applications in Optics, 65870X (9 May 2007); doi: 10.1117/12.722723
Show Author Affiliations
Jing Chen, Univ. of Cambridge (United Kingdom)
Stephen M. Morris, Univ. of Cambridge (United Kingdom)
Timothy D. Wilkinson, Univ. of Cambridge (United Kingdom)
Harry J. Coles, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 6587:
Liquid Crystals and Applications in Optics
Milada Glogarova; Peter Palffy-Muhoray; Martin Copic, Editor(s)

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