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- Title
Huge retardation of grating formation in holographic polymer-dispersed liquid crystals.
- Authors
Ellabban, M. A.; Drevenšek-Olenik, I.; Rupp, R. A.
- Abstract
Phototriggered kinetics is investigated in the dark for holographic polymer-dispersed liquid crystal gratings. Subsequently to holographic recording, the diffraction efficiency first slightly increases, then decreases, and afterwards starts to grow again. The remarkable growth continues for several days until the diffraction efficiency stabilizes at values several times larger than the initial ones. The initial increase is attributed to a dark polymerization reaction as confirmed by electron paramagnetic resonance spectroscopy. The slow process is associated with the kinetics of a phase-separation mechanism. The non-monotonic behaviour of the diffraction efficiency is explained by superposition of refractive-index and extinction modulations.
- Subjects
PHOTONICS; LIQUID crystals; DIFFRACTION gratings; ELECTRON paramagnetic resonance spectroscopy; OPTICS; OPTICAL diffraction
- Publication
Applied Physics B: Lasers & Optics, 2008, Vol 91, Issue 1, p11
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-008-2964-z