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Browsing by Author "O'Neill, M."

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    Article
    Measurement of Electro-Optical Parameters of a High Contrast Flc Film
    (Elsevier, 2009) Karapinar, R.; O'Neill, M.; Hird, M.
    We have fabricated a ferroelectric liquid crystal (FLC) film by using a novel ferroelectric mixture. The various ferroelectric parameters such as response time, spontaneous polarization and contrast ratio of the FLC film have been measured. Experimental results show that the FLC film exhibits high contrast ratios and fast optical response. The FLC film has a possibility of the use in display applications because of the performance characteristics. (C) 2008 Elsevier B.V. All rights reserved.
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    Article
    New Coumarin Polymers as Non-Contact Alignment Layers for Liquid Crystals
    (Taylor and Francis Inc., 1999) Hindmarsh, P.; Owen, G.J.; Kelly, S.M.; Jackson, P.O.; O'Neill, M.; Karapinar, R.
    The synthesis of polymethacrylate derivatives of 6- and 7-hydroxycoumarin is described and their use as photoinduced alignment layers for liquid crystals is discussed. Strong anchoring is found with azimuthal anchoring energies > 6.9 × 10-5 J m-2. The liquid crystal alignment direction is parallel to the polarisation direction of the incident UV light when low fluences are incident. At a critical fluence threshold, a sharp change to perpendicular alignment is found. The incorporation of a flexible spacer into the coumarin sidechain results in stronger anchoring at low fluences. These results are discussed in terms of a molecular model.