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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 41: Optical and Nonlinear Optical Properties I (joint session DF, CPP)

CPP 41.1: Hauptvortrag

Mittwoch, 18. März 2015, 09:30–10:00, EB 407

Holographic microstructuring of liquid-crystalline elastomers — •Irena Drevensek-Olenik^1,2, Martin Čopič^1,2, Martin Fally³, Valentina Domenici⁴, and Antoni Sánchez-Ferrer⁵ — ¹Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI1000 Ljubljana, Slovenia — ²J. Stefan Institute, Jamova 39, SI1000 Ljubljana, Slovenia — ³Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Wien, Austria — ⁴Dipartimento di Chimica e Chimica Industriale, Università degli studi di Pisa, via Risorgimento, 35, 56126 Pisa, Italy — ⁵Department of Health Sciences and Technology, ETH Zurich, Schmelzbergstrasse 9, 8091 Zurich, Switzerland

Adding a small amount of photoactive component, for instance a photo-isomerizable azobenzene derivative, to the matrix of a liquid-crystalline elastomer (LCE) opens up various possibilities for optical manipulation of mechanical, thermal, electrical and optical properties of the material. Holographic microstructuring in LCEs is based on the coupling between isomerization state of the azobenzene groups and orientational order of the mesogenic side chains. Due to collective nature of this process light-induced spatial modifications of optical refractive index in LCEs are several magnitudes larger than in conventional azobenzene-based holographic media. Holographic patterning of LCEs consequently provides a very convenient method for fabrication of tuneable optical diffraction structures that can easily be manipulated by external stimuli, such as strain, external fields and temperature variations.