Uniform Lying Helix Alignment on Periodic Surface Relief Structure Generated via Laser Scanning Lithography

Carbone, Giovanni; Corbett, Daniel; Raynes, Peter; Jesacher, Alexander; Simmonds, Richard; Booth, Martin J.

doi:10.1080/15421406.2011.569265

Cited by 26 publications

(22 citation statements)

References 22 publications

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“…A convenient value characterizing flexoelectric properties of a LC material is flexo-elastic coefficient e f / K 8910111213141516171819. Flexoelectric rotation of the HA always competes with undesired unwinding of the ULH CLC texture into a non-helical state due to dielectric coupling to applied electric field.…”

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confidence: 99%

“…A well-aligned ULH CLC texture can be obtained by application of pulsed electric field with empirically optimized duration and magnitude to the sample cell91819. Alternatively, a spontaneous formation of the ULH CLC texture have been demonstrated by treatment of the surface of substrates creating periodic micro-grooves1525, periodic anchoring conditions1426, controlling pretilt angle of LC molecules27, periodic polymer channels28 or polymer walls29.…”

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confidence: 99%

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Giant Flexoelectro-optic Effect with Liquid Crystal Dimer CB7CB

Varanytsia

Chien

2017

Sci Rep

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We demonstrate a giant flexoelectro-optic behavior of liquid crystal dimer CB7CB. Flexoelectric properties of CB7CB experimentally characterized by measured angle of an in-plane rotation of helical axis (HA) in polymer stabilized uniform lying helix cholesteric liquid crystal. The 45° rotation of HA providing full intensity modulation of transmitted through a pair of crossed polarizers light, is achieved with 4.5 V/μm with a sub-millisecond electro-optic switching time. Reported properties enable application of CB7CB in applications of the flexoelectric effect in fast switching photonic and electro-optic devices.

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confidence: 99%

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confidence: 99%

Giant Flexoelectro-optic Effect with Liquid Crystal Dimer CB7CB

Varanytsia

Chien

2017

Sci Rep

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“…One of the CLCs changes the sign of its dielectric anisotropy upon varying the temperature of the sample while the other one used is a dual frequency CLC. The effect of various experimental and materials parameters on ULH structure formation and its stability has been given considerable attention …”

Section: Uniform Lying Helix Structurementioning

confidence: 99%

Stimuli‐Driven Control of the Helical Axis of Self‐Organized Soft Helical Superstructures

2018

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Supramolecular and macromolecular functional helical superstructures are ubiquitous in nature and display an impressive catalog of intriguing and elegant properties and performances. In materials science, self-organized soft helical superstructures, i.e., cholesteric liquid crystals (CLCs), serve as model systems toward the understanding of morphology- and orientation-dependent properties of supramolecular dynamic helical architectures and their potential for technological applications. Moreover, most of the fascinating device applications of CLCs are primarily determined by different orientations of the helical axis. Here, the control of the helical axis orientation of CLCs and its dynamic switching in two and three dimensions using different external stimuli are summarized. Electric-field-, magnetic-field-, and light-irradiation-driven orientation control and reorientation of the helical axis of CLCs are described and highlighted. Different techniques and strategies developed to achieve a uniform lying helix structure are explored. Helical axis control in recently developed heliconical cholesteric systems is examined. The control of the helical axis orientation in spherical geometries such as microdroplets and microshells fabricated from these enticing photonic fluids is also explored. Future challenges and opportunities in this exciting area involving anisotropic chiral liquids are then discussed.

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“…In order to get high transparency for window applications, several methods achieving the stable transparent state in CLC are purposed. One is adjusting the PBG in P state with the PBG in non-visible wavelength region [7][8][9], another is stable the homeotropic state by polymer networks [10,11], the other is stable the uniform lying helix (ULH) state by polymer stabilization or periodic boundary conditions [12,13]. However, the structure in the bulk or boundary limited the orientation of LC.…”

Section: Introductionmentioning

confidence: 99%