P-18988 | Holographic polymer-dispersed liquid crystals for photonics | |
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Abstract English In the frame of this project we will generate complex structures from photosensitive composites of polymers and liquid crystals (H-PDLC) by holographic methods. The optical properties of these materials are governed by nanodroplets of liquid crystals within the polymer matrix. One thus can, for instance, switch an H-PDLC from an opaque to a completely transparent medium for light by application of an external electric field. The colossal light-induced refractive-index change further makes it possible to create so called photonic crystals, i.e., to periodically modulate the dielectric susceptibility, so that band gaps for photons are generated (stop bands). We are targeting on three major aims in this project:
The project will be run in cooperation with scientific institutes in Slovenia and Germany. The expected outcome will be: creation of novel nanostructured materials as well as new fundamental knowledge on them. These media will have an outstanding importance for optical technologies, in particular for the fabrication of next-generation photonic elements. Furthermore a new class of materials opens up for the construction of neutron optical components, maybe even for the production of neutronic crystals.
Abstract German m Rahmen dieses Projekt stellen wir komplexe Strukturen aus photosensitiven Kompositen von Polymeren und Flüssigkristallen (H-PDLC) mittels holographischer Methoden her. Die optischen Eigenschaften dieser Materialien sind durch die eingebetteten Nano-Tröpfchen des Flüssigkristalls bestimmt. So kann z.B. ein H-PDLC durch Anlegen eines äußeren elektrischen Feldes von einem optisch undurchlässigen Zustand in ein völlig transparentes Medium geschaltet werden. Durch die enorm hohe lichtinduzierte Brechwertänderung ist es außerdem möglich, Photonische Kristalle herzustellen, d.h., die dielelektrische Suszeptibilität periodisch zu modulieren, so dass Bandlücken für Photonen entstehen (sogenannte photonische Stoppbänder). Dieses Projekt verfolgt drei wesentliche Ziele:
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