Berlin 2005 – scientific programme
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HL: Halbleiterphysik
HL 62: Photonische Kristalle IV
HL 62.9: Talk
Wednesday, March 9, 2005, 12:45–13:00, TU P164
A new optical method to investigate the director field of liquid crystals appearing in a photonic crystal template — •Heinz Kitzerow1, Heinrich Matthias1, Thorsten Röder1, Sven Matthias2, Ralf Wehrspohn1, and Stephen Picken3 — 1Faculty of Science, University of Paderborn, Warburger Str. 100, 33098 Paderborn — 2Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle — 3Delft University of Technology, Dept Material Science and Technology, Julianalaan 136, Delft 2628 BL, The Netherlands
Photonic crystals can be actively tuned by filling these porous structures with liquid crystals. We report on results using fluorescence confocal polarizing microscopy (FCPM) to examine the director field of liquid crystals confined to modulated micrometer pores. The photonic crystal was filled with a glass-forming liquid crystalline polymer and cooled below the glass transition temperature to conserve the director field. After removing the photonic crystal template, we studied the remaining liquid crystal rods by FCPM. Evidences of a spatially periodic director field containing a lattice of disclination rings are found.