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Molecular Shape Related Effects in Liquid Crystals

Journal article
Authors Lachezar Komitov
Published in Molecular Crystals and Liquid Crystals
Volume 608
Issue 1
Pages 246-257
ISSN 1542-1406
Publication year 2015
Published at Department of Physics (GU)
Pages 246-257
Language en
Links dx.doi.org/10.1080/15421406.2014.97...
Keywords optically isotropic state, alignment transition, Photoisomerization, bent core nematics, flexoelectric, ELECTROOPTICAL PROPERTIES, SYSTEMS, LIGHT, Crystallography
Subject categories Optical physics

Abstract

Liquid crystals are organic materials constituting of molecules characterized by strong shape anisotropy. Many studies unambiguously showed that some important physical effects observed in liquid crystals are strongly dependent on the shape anisotropy of their molecules. In this talk, some of the molecular shape related effects in liquid crystals, which have a potential for applications in liquid crystal displays (LCDs) and photonic devices, was overviewed. Photo-induced alignment transition from planar to vertical, flexoelectric polarization in short pitch cholesteric liquid crystals, alignment of bent core nematics as well as field driven transition from birefringent to optically isotropic state in these materials are among those effects on which this talk was focused. The role of the molecular shape was discussed with focus on the impact, which it has on the anchoring, flexoelectric, optical and electro-optical properties of the liquid crystals.

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