Calculation of chevron profiles in ferroelectric liquid crystal cells

Meyere, Arnout De; Pauwels, Herman; Ley, Erwin De

doi:10.1080/02678299308026440

Cited by 25 publications

(6 citation statements)

References 19 publications

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“…Subsequent models removed this constraint, allowing, instead, quantities such as the azimuthal angle, cone angle and layer dilatation to vary through the interface as well as the layer tilt [13,14]. More recently, these approaches have been used to treat the effects of shear on the structure and stability of the chevron [15].…”

Section: Introductionmentioning

confidence: 99%

Molecular simulation of chevrons in confined smectic liquid crystals

2003

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Chevron structures adopted by confined smectic liquid crystals are investigated via molecular dynamics simulations of the Gay-Berne model. The chevrons are formed by quenching nematic films confined between aligning planar substrates whose easy axes have opposing azimuthal components. When the substrates are perfectly smooth, the chevron formed migrates rapidly towards one of the confining walls to yield a tilted layer structure. However, when substrate roughness is included, by introducing a small-amplitude modulation to the particlesubstrate interaction well-depth, a symmetric chevron is formed which remains stable over sufficiently long runtimes for detailed structural information, such as the relevant order parameters and director orientation, to be determined. For both smooth and rough boundaries, the smectic order parameter remains non-zero across the entire chevron, implying that layer identity is maintained across the chevron tip. Also, when the surface-stabilised chevron does eventually revert to a tilted layer structure, it does so via surface slippage, such that layer integrity is maintained throughout the chevron to tilted layer relaxation process.

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Section: Introductionmentioning

confidence: 99%

Molecular simulation of chevrons in confined smectic liquid crystals

2003

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“…Even though the molecule and layer tilt are allowed to vary, the defect free condition is equivalent to constraining the angles in order to maintain the horizontal spacing. de Meyere et al [30] employed an equivalent relationship in their study of smectic profiles, while other authors (e.g. Beldon et al [35]) are less strict in their geometrical approach and employ a linear relationship δ = µθ for some constant µ.…”

Section: Bookshelf and Chevron Geometriesmentioning

confidence: 98%

“…Indeed Nakagawa [28] extensively studied the elastic properties of such liquid crystals and presented a general free energy very similar to that of Leslie and co-workers. A comparable approach was adopted by de Meyere et al [30] who assumed that the molecule tilt was related to the layer tilt. Limat and Prost [31] examined the transition between the Sm A bookshelf structure and the Sm C chevron, while Limat [32] extended the work of Nakagawa [28] to allow for unequal cone and layer tilt angles.…”

Section: Bookshelf and Chevron Geometriesmentioning

confidence: 99%

Modelling smectics in confined geometries

McKay

2004

Journal of Non-Newtonian Fluid Mechanics

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“…[3][4][5] Another approach assumed that the molecular tilt in FLCs is related to the layer tilt. [6] In Ref. [7], Limat extended the model, [4] where unequal cone and layer tilt angles are allowed.…”

Section: Introductionmentioning

confidence: 99%

Electro–optic response in thin smectic C* film with chevron structures

2016

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The effects in electrostatic models of chevron surface-stabilized ferroelectric liquid crystals are investigated through numerical modeling. To study smectic C* director distribution within the cell, we consider two nonlinear approaches: the chevron interface does not interplay with the electric field; the electric field interplays with the chevron interface. The obtained results of the director field distribution are compared with the earlier linearized studies. We find that whether or not the electric field interplays with the chevron interface, the electro–optic response requires a generalized approach for its description. The threshold electric field, which is necessary for switching between two stable director states in the chevron cell is evaluated. This study suggests that, in many cases of practical interest, electro–optic response to the electric field and the threshold electric field can be precisely estimated. We argue that, beside being numerically efficient, our approach provides a convenient and a novel standpoint for looking at the electro–optic response problem.

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Calculation of chevron profiles in ferroelectric liquid crystal cells

Cited by 25 publications

References 19 publications

Molecular simulation of chevrons in confined smectic liquid crystals

Molecular simulation of chevrons in confined smectic liquid crystals

Modelling smectics in confined geometries

Electro–optic response in thin smectic C* film with chevron structures

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