Liquid crystal display modes in a nontilted bent-core biaxial smectic liquid crystal

Nagaraj, Mamatha; Panarin, Yu. P.; Vij, J. K.; Keith, Christina; Tschierske, Carsten

doi:10.1063/1.3513832

Cited by 44 publications

(33 citation statements)

References 14 publications

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“…[16]. An application of electric field to biaxial Sm-AP A disturbs an antiparallel structure of polar directors in adjacent layers and finally causes the phase transition to the field-induced biaxial ferroelectric state Sm-AP F through the intermediate nonbirefringent uniaxial state [15]. Theoretically both states must be optically equivalent, i.e., have the same polarizability tensor but preliminary experiment shows that the birefringence magnitudes in Sm-AP A and in the field-induced Sm-AP F phases are of the same value ( n AF ≈ n F ) while values of biaxiality are different (δn AF <δn F ) [26].…”

Section: Methodsmentioning

confidence: 99%

“…The biaxiality in orthogonal smectics can be exploited to produce fast electro-optic devices since it has already been established that LCs are excellently aligned in these phases [15,16]. The anisotropic properties of LCs can be characterized by the molecular polarizability tensor χ M n,ij which can be diagonalized in the molecular frame as χ…”

Section: Theorymentioning

confidence: 99%

“…In the Sm-AP A phase, polar directions in the neighboring layers are antiparallel leading to the biaxial antiferroelectric phase. An application of the in-plane electric field higher than its threshold value in the Sm-AP A phase causes a field-induced transition to the ferroelectric Sm-AP F state [15,16].…”

Section: Introductionmentioning

confidence: 99%

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Biaxial order parameter in the homologous series of orthogonal bent-core smectic liquid crystals

Sreenilayam¹,

Panarin

Vij

et al. 2013

Phys. Rev. E

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This version is available at https://strathprints.strath.ac.uk/47177/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output.PHYSICAL REVIEW E 88, 012504 (2013) Biaxial order parameter in the homologous series of orthogonal bent-core smectic liquid crystals The fundamental parameter of the uniaxial liquid crystalline state that governs nearly all of its physical properties is the primary orientational order parameter (S) for the long axes of molecules with respect to the director. The biaxial liquid crystals (LCs) possess biaxial order parameters depending on the phase symmetry of the system. In this paper we show that in the first approximation a biaxial orthogonal smectic phase can be described by two primary order parameters: S for the long axes and C for the ordering of the short axes of molecules. The temperature dependencies of S and C are obtained by the Haller's extrapolation technique through measurements of the optical birefringence and biaxiality on a nontilted polar antiferroelectric (Sm-AP A ) phase of a homologous series of LCs built from the bent-core achiral molecules. For such a biaxial smectic phase both S and C, particularly the temperature dependency of the latter, are being experimentally determined. Results show that S in the orthogonal smectic phase composed of bent cores is higher than in Sm-A calamatic LCs and C is also significantly large.

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Section: Methodsmentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

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Biaxial order parameter in the homologous series of orthogonal bent-core smectic liquid crystals

Sreenilayam¹,

Panarin

Vij

et al. 2013

Phys. Rev. E

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“…The first experimental evidence for the existence of a SmAP phase in bent-core liquid crystals was given by Eremin et.al [12] The compound exhibited a biaxial antiferroelectric polar smectic A (SmAPA) phase with the polarization of alternating neighbouring layers being antiparallel [ Fig.1]. A number of novel electro-optic effects in the SmAPA phase were reported by Nagaraj et al [13] where the reorientations in the SmAPA phase exhibit biaxial-uniaxial-biaxial transitions, with switching times of the order of ~500 µsec [13][14]. The SmAPR phase, a lamellar structure that has random arrangement of the in-layer polarization, was discovered by Pociecha et al in 2003.…”

Section: Orthogonal Polar Smectic Phasesmentioning

confidence: 99%

Dark conglomerate phases of bent-core liquid crystals

Nagaraj

2016

Liquid Crystals

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Spontaneous or induced chiral symmetry breaking in achiral systems is unusual and understanding the origin of such a phenomenon has been an important area of research for several years. The optically isotropic mesophases exhibited by unconventional liquid crystals are one of the most interesting systems to investigate spontaneous chiral symmetry breaking in liquid crystal mesophases formed by achiral moieties. The dark conglomerate (DC) phases are one such optically isotropic family of phases. In this paper, a detailed account of the tendency of bent-core mesogens to form a variety of polar smectic phases, the formation of DC phases due to layers deformations and the general optical, electrical, physical properties of the DC phases are given. An example of a dark conglomerate phase which exhibit distinct electro-optic properties is described with the nature of dynamics of the response and physical reasons responsible for such behaviour. The challenges and prospects of the dark conglomerate phases are discussed for their potential applications in novel devices.

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“…Recently, the discovery of nematic LCs constituting of bent core (BC) molecules draw the attention of scientists and engineers due to the predicted biaxial properties which they may have and the advantages which these LC materials may offer for application in displays as fast switching, for instance. [1][2][3] However, the biaxiality of BC nematics is still an issue under discussion.…”

mentioning

confidence: 99%

Optically isotropic state in bent core nematic mixtures with rod like molecules induced by direct current electric field

Elamain

Hegde

Fodor‐Csorba

et al. 2013

Applied Physics Letters

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One of the most important characteristic of the liquid crystal displays is the contrast of the generated images. The dark state of the display is a prerequisite for a high image contrast. Optically isotropic state was observed in bent core nematic mixtures containing rod like molecules induced by low applied dc electric field. It is found that the switching properties of these nematic mixtures depend on the concentration of the rod like molecules. Comparatively high concentrations of rod like molecules in the mixtures resulted in an improvement of the contrast and switching properties of the bent core nematic mixtures, thus demonstrating their potential for display applications.

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Liquid crystal display modes in a nontilted bent-core biaxial smectic liquid crystal

Cited by 44 publications

References 14 publications

Biaxial order parameter in the homologous series of orthogonal bent-core smectic liquid crystals

Biaxial order parameter in the homologous series of orthogonal bent-core smectic liquid crystals

Dark conglomerate phases of bent-core liquid crystals

Optically isotropic state in bent core nematic mixtures with rod like molecules induced by direct current electric field

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