13 August 1993 Ring-substituted diphenyldiacetylenes for use in ferroelectric liquid crystal spatial light modulators
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Abstract
Ferroelectric smectic C* liquid crystals have been shown to exhibit high speed, multistate electro-optic switching, particularly when incorporated into the surface stabilized ferroelectric liquid crystal (SSFLC) light valve. Certain applications utilizing IR modulation, waveguide, phase modulation, and fiber-optic devices can benefit from a birefringence higher than the value of (Delta) n equals 0.15 seen in typical FLC materials. By incorporating the highly conjugated diacetylene moiety into an FLC core, an increase in birefringence greater than (Delta) n equals 0.3 is achieved. Lateral fluorination of the core induces a strong preference for the tilted smectic C phase as compared to the unfluorinated materials which typically show the nematic phase. The effect of other substitutions is explored on the mesogenic properties of the basic core structure.
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Michael D. Wand, Sean Monohan, David Liptak, Rohini T. Vohra, "Ring-substituted diphenyldiacetylenes for use in ferroelectric liquid crystal spatial light modulators", Proc. SPIE 1911, Liquid Crystal Materials, Devices, and Applications II, (13 August 1993); doi: 10.1117/12.151225; https://doi.org/10.1117/12.151225
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KEYWORDS
Birefringence

Liquid crystals

Crystals

Liquids

Ferroelectric LCDs

Fluorine

Modulators

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