Electro-optics of cholesterics with oblique helicoidal director (Conference Presentation)

Oleg D. Lavrentovich; Olena Iadlovska; Sergij V. Shiyanovskii

doi:10.1117/12.2272608

19 September 2017 Electro-optics of cholesterics with oblique helicoidal director (Conference Presentation)

Oleg D. Lavrentovich, Olena Iadlovska, Sergij V. Shiyanovskii

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Proceedings Volume 10361, Liquid Crystals XXI; 1036102 (2017) https://doi.org/10.1117/12.2272608
Event: SPIE Organic Photonics + Electronics, 2017, San Diego, California, United States

Abstract

Liquid crystal materials with tendency to bend are capable of forming a unique type of a helicoidal structure in which the director is titled with respect to the helicoidal axis rather than orthogonal to it, as in regular cholecterics. The new state occurs in presence of an electric or magnetic field. It is called a cholesteric with oblique helicoidal structure or simply a twist-bend cholesteric, since both twist and bend deformations are characteristic of the ground state supported by the external field. Tilted configuration of the director and absence of density modulation makes the twist-bend cholesterics a unique material for various electro-optical applications. The presentation discusses electrically and magnetically tuned selective reflection of light as well as tunable lasing enabled by these materials. It is demonstrated that the electro-optical performance of the twist-bend cholesterics depends strongly on the type of anchoring conditions imposed by the boundaries of the cell. The work is supported by NSF grant DMR-1410378.

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Oleg D. Lavrentovich, Olena Iadlovska, and Sergij V. Shiyanovskii "Electro-optics of cholesterics with oblique helicoidal director (Conference Presentation)", Proc. SPIE 10361, Liquid Crystals XXI, 1036102 (19 September 2017); https://doi.org/10.1117/12.2272608

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KEYWORDS

Electro optics

Reflection

Liquid crystals

Crystals

Liquids

Magnetism

Modulation

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