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Surface-assisted photoalignment in dye-doped liquid-crystal films.
Lee, C-R; Fu, T-L; Cheng, K-T; Mo, T-S; Fuh, A Y-G.
Afiliação
  • Lee CR; Department of Physics, National Cheng Kung University, Tainan, Taiwan 701, Republic of China.
Phys Rev E Stat Nonlin Soft Matter Phys ; 69(3 Pt 1): 031704, 2004 Mar.
Article em En | MEDLINE | ID: mdl-15089307
This study examines the surface-assisted photoalignment effect of dye-doped liquid-crystal films having a homogeneous alignment. Observations made using a polarizing optical microscope, a scanning electronic microscope, and an atomic force microscope confirm that the morphology of laser-induced surface-adsorbed dyes at the command surface strongly affects the orientation of liquid crystals (LC's) in a manner that depends significantly on the intensity and duration of the pumping. In weak-intensity regime, a homogeneous and fine layer of adsorbed dyes competes with a layer of ripple structure in reorienting LC's. These two effects dominantly cause LC's to reorient perpendicular and parallel to the polarization direction of the pump beam in the early and late stages, respectively. In the high-intensity regime, rough and inhomogeneous ribbonlike adsorbents produced by rapid and random aggregation and adsorption form on the top of the preformed microgrooves, reorienting LC's irregularly. This surface morphology does not enable photoalignment.
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Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev E Stat Nonlin Soft Matter Phys Assunto da revista: BIOFISICA / FISIOLOGIA Ano de publicação: 2004 Tipo de documento: Article País de afiliação: China
Buscar no Google
Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev E Stat Nonlin Soft Matter Phys Assunto da revista: BIOFISICA / FISIOLOGIA Ano de publicação: 2004 Tipo de documento: Article País de afiliação: China
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