Chiral ferroelectric nematic in Grandjean-Cano wedge cell

Kamal Thapa; Olena S. Iadlovska; Bijaya Basnet; Hao Wang; Ayusha Paul; James T. Gleeson; Oleg D. Lavrentovich

doi:10.1117/12.2675751

29 September 2023 Chiral ferroelectric nematic in Grandjean-Cano wedge cell

Kamal Thapa, Olena S. Iadlovska, Bijaya Basnet, Hao Wang, Ayusha Paul, James T. Gleeson, Oleg D. Lavrentovich

Proceedings Volume 12658, Liquid Crystals XXVII; 126580A (2023) https://doi.org/10.1117/12.2675751
Event: SPIE Organic Photonics + Electronics, 2023, San Diego, California, United States

Abstract

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.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Kamal Thapa, Olena S. Iadlovska, Bijaya Basnet, Hao Wang, Ayusha Paul, James T. Gleeson, and Oleg D. Lavrentovich "Chiral ferroelectric nematic in Grandjean-Cano wedge cell", Proc. SPIE 12658, Liquid Crystals XXVII, 126580A (29 September 2023); https://doi.org/10.1117/12.2675751

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KEYWORDS

Polarization

Deformation

Elasticity

Electric fields

Polarizers

Liquid crystals

Ferroelectric materials

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