Huge retardation of grating formation in holographic polymer-dispersed liquid crystals

Autor(en)

Mostafa Ellabban, Irena Drevensek-Olenik, Romano Rupp

Abstrakt

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.

Organisation(en)

Physik Funktioneller Materialien

Externe Organisation(en)

University of Ljubljana

Journal

Applied Physics B: Lasers and Optics

Band

91

Seiten

11-15

Anzahl der Seiten

5

ISSN

0946-2171

DOI

https://doi.org/10.1007/s00340-008-2964-z

Publikationsdatum

2008

Peer-reviewed

Ja

ÖFOS 2012

103023 Polymerphysik, 103021 Optik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/0452be0e-aae0-4a97-9ec6-be30be6fa899