Giant Flexoelectro-optic Effect with Liquid Crystal Dimer CB7CB

Varanytsia, Andrii; Chien, Liang–Chy

doi:10.1038/srep41333

Cited by 49 publications

(57 citation statements)

References 36 publications

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“…Twist-bend nematic liquid crystals have attracted a great deal of attention for a number of reasons, including high flexoelectric effect [17,18] and ultra-fast response times, making them promising for applications in fast-switching photonic and electro-optic devices. A recent paper [19] reporting a sub-millisecond electro-optic switching time of a dimer exhibiting the NTB phase suggests the prospects of these materials for application in 3D liquid crystal displays and as active retarders for quantum computing.…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of liquid crystalline dimer mixtures exhibiting the nematic and twist-bend nematic phases

2017

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© 2017 American Physical Society. This is an author produced version of a paper published in Physical Review E. Uploaded in accordance with the publisher's self-archiving policy.eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse Unless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. A detailed investigation of the thermal and dielectric properties of a series of binary mixtures exhibiting the nematic (N) and twist-bend nematic (NTB) liquid crystal phases is presented. The mixtures consist of an achiral, dimeric liquid crystal CB7CB, which forms the nematic and twist-bend nematic phases, and a calamitic liquid crystal 5CB, which shows the nematic phase. As the concentration of the calamitic liquid crystal is increased, the transition temperatures decrease linearly, and the width of the nematic phase increases. The enthalpies of phase transitions obtained from DSC measurements show that on increasing the concentration of 5CB in the binary mixtures, the enthalpy associated with the N to NTB phase transitions reduces considerably compared to a clear first order N-NTB transition in pure CB7CB. The real and imaginary parts of the dielectric permittivity are measured as a function of frequency from 100 Hz to 2 MHz in the nematic and twist-bend nematic phases in planar and homeotropic devices. A significant decrease in the average dielectric permittivity as a function of temperature for mixtures forming the NTB phase is observed. Measurements of the imaginary part of the dielectric permittivity show a relaxation peak in the measured frequency window for all of the mixtures exhibiting the NTB phase. The activation energy associated with this relaxation process is calculated and is shown to remain constant irrespective of the composition of the mixtures.2

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Section: Introductionmentioning

confidence: 99%

Dielectric properties of liquid crystalline dimer mixtures exhibiting the nematic and twist-bend nematic phases

2017

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“…Small value of the ratio of bend over twist elastic constants, K3/K2, enables electrically-induced oblique heliconical CLC texture (CLCOH) [9]. Bimesogenic CLCs have wide-ranging application potential in devices such as CLCOH lasers [10], active color filters, fast switching active retarders and light modulators benefiting from strong flexoelectric properties of bimesogenic LC materials [11][12][13][14][15]. The self-assembly of CLCOH structure with low K3 occurs upon reducing the electric field from a homeotropic configuration [6,7].…”

Section: Objective and Backgroundmentioning

confidence: 99%

P‐165: Effect of Polarized Light Polymerization on Reflection Band Tunability in Polymer‐Stabilized Bimesogenic Cholesteric Liquid Crystal Devices

Varanytsia

Joshi

Chien

2019

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This work demonstrates approach for improvement of electrooptic performance and light reflectance properties of electricallycontrolled reflective heliconical cholesteric liquid crystal (CLCOH) textures. A noticeable increase of the electric field range which supports the CLCOH texture is demonstrated by using photo polymerization with polarized UV light. Such performance improvement broadens the scope of potential applications of CLCOH materials in electro-optical devices. Author KeywordsColor smart window; polymer-stabilized; bimesogenic cholesteric liquid crystal; oblique heliconical texture.

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“…Intriguing electro-optic effects in liquid crystals (LCs) with ultra-fast response time have always kept researchers interested for their next-generation applications like augmented-reality or energy-efficient displays. [1][2][3][4] The dynamically-slow dielectric coupling of LCs have hindered the technological advancement in the field of displays and other electro-optic devices. A linear flexoelectro-optic effect in a short-pitch cholesteric LC resulting in a spontaneous polarization from helical axis rotation, was first predicted and experimentally demonstrated by Patel and Meyer.…”

Section: Objective and Backgroundmentioning

confidence: 99%

P‐151: Giant Flexoelectro‐Optic Effect with Bimesogen in Vertical Standing Helix

Joshi

Chang

Varanytsia

et al. 2018

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Giant Flexoelectro-optic Effect with Liquid Crystal Dimer CB7CB

Cited by 49 publications

References 36 publications

Dielectric properties of liquid crystalline dimer mixtures exhibiting the nematic and twist-bend nematic phases

Dielectric properties of liquid crystalline dimer mixtures exhibiting the nematic and twist-bend nematic phases

P‐165: Effect of Polarized Light Polymerization on Reflection Band Tunability in Polymer‐Stabilized Bimesogenic Cholesteric Liquid Crystal Devices

P‐151: Giant Flexoelectro‐Optic Effect with Bimesogen in Vertical Standing Helix

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