Photo-aligned and photo-conductive polymer layers for photorefractive liquid crystal cells of high transmittance

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The optical performance of photorefractive cells of liquid crystals strongly depends on the alignment of liquid crystals stabilized by surface states. Two photo-aligned polymer layers with relatively weak anchoring energy were investigated by FT-IR and UV/VIS spectroscopies. The cells without alignment layers showed significant scatterings due to random switching under an applied field. The cells with photo-alignment layers showed the high transmittance because of the high orientation order, but a little decrease in gain coefficient and diffraction efficiency because of the decrease in trap sites. Therefore, it is concluded that the reorientation of liquid crystals onto photo-conduction layer would govern the photorefractivity in two-beam coupling experiments. (C) 2002 Elsevier Science B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2003-01
Language
English
Article Type
Article; Proceedings Paper
Keywords

POLARIZED UV-LIGHT; ALIGNMENT; FILMS; PHOTOALIGNMENT; SURFACES

Citation

OPTICAL MATERIALS, v.21, no.1-3, pp.657 - 662

ISSN
0925-3467
URI
http://hdl.handle.net/10203/79672
Appears in Collection
PH-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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