Photoalignment anchoring energy of photocrosslinkable liquid crystalline polymers doped in nematic liquid crystals

We characterized the photoalignment anchoring energy of photocrosslinkable liquid crystalline polymers (PLCPs) doped in a liquid crystal (LC). PLCP-doped LC cells with homogeneous alignment were fabricated using rubbed polyimide (PI) films. The PLCP-doped LC cells were exposed to a linearly polarize...

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Bibliographic Details
Published in:Optical materials express 2016-08, Vol.6 (8), p.2521-2529
Main Authors: Sasaki, Tomoyuki, Shoho, Takashi, Tien, Tran Minh, Goto, Kohei, Sakamoto, Moritsugu, Noda, Kohei, Kawatsuki, Nobuhiro, Ono, Hiroshi
Format: Article
Language:English
Subjects:
Anchoring
Beams (radiation)
Liquid crystal polymers
Liquid crystals
Nematic crystals
Polyimide resins
Realignment
Strength
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Summary:We characterized the photoalignment anchoring energy of photocrosslinkable liquid crystalline polymers (PLCPs) doped in a liquid crystal (LC). PLCP-doped LC cells with homogeneous alignment were fabricated using rubbed polyimide (PI) films. The PLCP-doped LC cells were exposed to a linearly polarized ultraviolet laser beam, and were then annealed. As a result, the PLCP-doped LCs were realigned owing to the axis-selective photocrosslink reaction. We investigated the relationship between the surface anchoring strength of the rubbed PI films and the realignment direction. The result suggested that the photoalignment anchoring strength of the PLCP in the LC is higher than 4 x 10 super(2) J/m super(3) at the maximum. The photoalignment realized substantial realignment in the LC cell with the surface anchoring strength of 10-4 J/m2.
ISSN:2159-3930
2159-3930
DOI:10.1364/OME.6.002521