| Autor: |
Kozenkov, V. M., Chigrinov, V. G., Kwok, H. S. |
| Předmět: |
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| Zdroj: |
Molecular Crystals & Liquid Crystals; 2004, Vol. 409 Issue 1, p251-267, 17p |
| Abstrakt: |
The effect of LC photo-aligning by poly(vinyl-cinnamate) (PVCi) derivatives is consequent to the phenomena of the photo-induced optical anisotropy, found in PVCi films during their illumination by UV-light within the self-absorption band of the PVCi film. We proved in our experiment, that the phenomena of the photo-induced birefringence in thin films of PVC derivatives takes place due to the two main factors: described earlier irreversible photochemical process (2 + 2) cycloaddition of cinnamoyl groups and reversible photophysical reorientation of the chromophore groups, that accumulates photochemical non-active part of the UV-light energy. We reviewed various applications of the effect of photo-induced optical anisotropy in PVCi films including: writing the polarization holograms and images, optical data processing, development of different polarization optical elements, non-destructive testing of defects, LC photo-aligning. Most of the early papers, devoted to the above mentioned applications were published in 1977–1987 in USSR only and are not well known worldwide. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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