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Active and passive LC based polarization elements

: Stumpe, J.; Sakhno, O.; Gritsai, Y.; Rosenhauer, R.; Fischer, T.; Rutloh, M.; Schaal, F.; Weidenfeld, S.; Jetter, M.; Michler, P.; Pruss, C.; Osten, W.


Molecular Crystals and Liquid Crystals 594 (2014), No.1, pp.140 -149
ISSN: 0026-8941
ISSN: 1542-1406
Journal Article
Fraunhofer IAP ()

Passive and active polarization elements were created by surface and bulk photo-alignment of LCs, reactive LCs, photo-sensitive LCP and photo-curable monomer/LC composites. The use of different photo­sensitive liquid crystalline materials for the development of highly anisotropic elements with high spatial resolution and stability or, alternatively, fast switch ability will be discussed. Photo-active and voltage tunable polarization and diffraction elements are presented. For active micro-optic application a photo-addressed patterned retarder was created. Electrically switchable diffraction gratings were generated by interference exposure of photo-curable LC composites at room temperature characterized by droplet free morphology. These polarization sensitive diffraction elements are characterized be excellent optical properties and low switching times.