From Event: SPIE Organic Photonics + Electronics, 2017
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.
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 (Presented at SPIE Organic Photonics + Electronics: August 06, 2017; Published: 19 September 2017); https://doi.org/10.1117/12.2272608.5581127960001.
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