Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS
Volume 5, Issue 3, Pages 247-265Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jphotochemrev.2004.10.004
Keywords
liquid crystal; azobenzene; photoisomerization; photochemical phase transition; alignment change; holography; photomechanical effect
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Recent progress in alignment modulation of azobenzene-containing liquid crystal systems by photochemical reactions has been reviewed by dividing the modulation methods into two types: phase transitions (order-disorder change) and change of liquid crystal directors (order-order change). First, photochemical phase transitions and alignment changes of liquid crystals in guest/host mixtures and polymers are summarized. Then, alignment control of liquid crystals by linearly polarized light and photoactive surface layers is discussed. Finally, recent applications of alignment change and photochemical phase transitions of liquid crystals in holographic technology and photomechanical effects are introduced. In addition, future possible applications for a variety of practical devices, such as display devices, optical switching and reversible optical image storage, are mentioned. (C) 2004 Japanese Photochemistry Association. Published by Elsevier B.V. All rights reserved.
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