Mr. Bijaya Basnet Profile

Bijaya Basnet

at Kent State Univ

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Proceedings Article | 29 September 2023 Paper

Chiral ferroelectric nematic in Grandjean-Cano wedge cell

Kamal Thapa, Olena Iadlovska, Bijaya Basnet, Hao Wang, Ayusha Paul, James Gleeson, Oleg Lavrentovich

Proceedings Volume 12658, 126580A (2023) https://doi.org/10.1117/12.2675751

KEYWORDS: Polarization, Deformation, Polarizers, Electric fields, Elasticity, Liquid crystals, Ferroelectric materials

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We explore the structures and confinement-induced edge dislocations in Grandjean-Cano wedge cells filled with the recently discovered chiral ferroelectric nematic (NF ∗ ) and chiral antiferroelectric smectic-Z (SmZA ∗ ). The chiral mixture is formed by DIO mesogen doped with a chiral additive. Wedge cells with parallel and antiparallel rubbing at the opposite plates show quantitatively different structures which is attributed to the polar in-plane anchoring of the spontaneous polarization at the rubbed substrates. The helical pitch shows a non-monotonous temperature dependence upon cooling, increasing as the temperature is lowered to the N ∗ -SmZA ∗ phase transition. The SmZA ∗ formed from an untwisted N ∗ in the thin portion of the wedge shows a bookshelf (BK) geometry, whereas the twisted N ∗ transforms into a twisted planar (PA) SmZA ∗ structure. In the NF ∗ phase, the untwisted N ∗ becomes twisted in a wedge with antiparallel assembly of plates and monodomain in wedges with parallel assembly. The twisted regions of NF ∗ show only one type of Grandjean zones separated by thick edge dislocations with Burgers vector 𝑏 = 𝑃; the neighboring regions differ by 2π- twist.

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