Determination of surface anchoring energies of liquid crystals by optical diffraction

Chang-Jae Yu, Jae Hong Park, Sin Doo Lee

Research output: Contribution to journalConference article

7 Citations (Scopus)

Abstract

We propose a simple method of determining the surface anchoring energies of liquid crystals (LCs) in a binary grating structure. In the configuration of an alternating hybrid and homeotropic geometry, the director of the LC molecules is linearly deformed near domain boundaries according to the continuum theory. From the far-field optical diffraction formula for the phase profile in a form of a trapezoid, the extrapolation lengths, corresponding to the distorted lengths at a domain boundary, were obtained. The surface anchoring energies of the LCs are directly determined from the measured extrapolation lengths.

Original languageEnglish
Pages (from-to)385-389
Number of pages5
JournalApplied Surface Science
Volume238
Issue number1-4 SPEC. ISS.
DOIs
StatePublished - 2004 Nov 15
EventAPHYS 2003 - Badajoz, Spain
Duration: 2003 Oct 132003 Oct 18

Fingerprint

Liquid Crystals
Interfacial energy
Liquid crystals
surface energy
Diffraction
liquid crystals
Extrapolation
extrapolation
diffraction
trapezoids
far fields
gratings
continuums
Molecules
Geometry
profiles
geometry
configurations
molecules

Keywords

  • Anchoring energy
  • Continuum theory
  • Diffraction grating
  • Liquid crystal devices

Cite this

Yu, Chang-Jae ; Park, Jae Hong ; Lee, Sin Doo. / Determination of surface anchoring energies of liquid crystals by optical diffraction. In: Applied Surface Science. 2004 ; Vol. 238, No. 1-4 SPEC. ISS. pp. 385-389.
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Determination of surface anchoring energies of liquid crystals by optical diffraction. / Yu, Chang-Jae; Park, Jae Hong; Lee, Sin Doo.

In: Applied Surface Science, Vol. 238, No. 1-4 SPEC. ISS., 15.11.2004, p. 385-389.

Research output: Contribution to journalConference article

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N2 - We propose a simple method of determining the surface anchoring energies of liquid crystals (LCs) in a binary grating structure. In the configuration of an alternating hybrid and homeotropic geometry, the director of the LC molecules is linearly deformed near domain boundaries according to the continuum theory. From the far-field optical diffraction formula for the phase profile in a form of a trapezoid, the extrapolation lengths, corresponding to the distorted lengths at a domain boundary, were obtained. The surface anchoring energies of the LCs are directly determined from the measured extrapolation lengths.

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