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20 August 2020 Optics of oblique helicoidal cholesterics
Oleg D. Lavrentovich
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Proceedings Volume 11472, Liquid Crystals XXIV; 1147202 (2020) https://doi.org/10.1117/12.2564924
Event: SPIE Organic Photonics + Electronics, 2020, Online Only
Abstract
Liquid crystal materials containing flexible molecular dimers and chiral dopants form a peculiar type of a cholesteric with an oblique helicoidal structure (ChOH), in which the director is titled with respect to the helicoidal axis rather than orthogonal to it, as in regular cholecterics. The heliconical ChOH state occurs in presence of an electric or magnetic field. Tilted configuration of the director and absence of density modulation makes ChOH a unique material for various electro-optical applications. The presentation discusses electrically tunable selective reflection by ChOH and how it can be used to get an insight into the elastic properties of these materials such as bend modulus. The work is supported by NSF grant ECCS-190610.
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Oleg D. Lavrentovich "Optics of oblique helicoidal cholesterics", Proc. SPIE 11472, Liquid Crystals XXIV, 1147202 (20 August 2020); https://doi.org/10.1117/12.2564924
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KEYWORDS
Electro optics
Liquid crystals
Magnetism
Modulation
Temperature metrology
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