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Title: Enhanced optoelastic interaction range in liquid crystals with negative dielectric anisotropy

We demonstrate that the long-range interaction between surface-functionalized microparticles immersed a nematic liquid crystal—a “nematic colloid”—and a laser-induced “ghost colloid” can be enhanced by a low-voltage quasistatic electric field when the nematic mesophase has a negative dielectric anisotropy. The optoelastic trapping distance is shown to be enhanced by a factor up to 2.5 in presence of an electric field. Experimental data are quantitatively described with a theoretical model accounting for the spatial overlap between the orientational distortions around the microparticle and those induced by the trapping light beam itself.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Dipartimento di Scienze e Ingegneria della Materia, dell'Ambiente ed Urbanistica and CNISM, Università Politecnica delle Marche, Ancona (Italy)
  2. Center for Nano Science and Technology-PoliMi, Istituto Italiano di Tecnologia, Via Giovanni Pascoli, 70/3, 20133 Milano (Italy)
  3. Univ. Bordeaux and CNRS, Laboratoire Ondes et Matière d'Aquitaine, UMR 5798, F-33400 Talence (France)
Publication Date:
OSTI Identifier:
22257215
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DIELECTRIC MATERIALS; ELECTRIC FIELDS; INTERACTION RANGE; LASERS; LIQUID CRYSTALS