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Q: Quantenoptik und Photonik

Q 35: Poster Photonische Kristalle

Q 35.2: Poster

Dienstag, 14. März 2006, 16:30–18:30, Labsaal

Director Fields and Optical Properties of Liquid Crystals in Photonic Crystals — •Heinz Kitzerow and Heinrich Matthias — Universität Paderborn, Warburger Str. 100, 33098 Paderborn

It is well known that nematic liquid crystals can be utilized to shift the stop band of a photonic crystal. Research on the director field of liquid crystals filled in macropores is necessary in order to achieve a better understanding of the optical properties of these tunable photonic crystals. Our recent studies on homeotropically aligned liquid crystals show that the modulation of the pore diameter stabilizes periodic arrays of ring disclinations in an escaped radial director field [1]. In this contribution, theoretical examinations of the transmission spectra using both the Berreman 4x4-matrix method and a one dimensional transfer model are presented and compared to experimental results.

[1] H. Matthias, T. Röder, S. Matthias, R. B. Wehrspohn, S. Picken and H.-S. Kitzerow: No-dqSpatially Periodic Liquid Crystal Director Field Appearing in a Photonic Crystal TemplateNo-dq, Appl. Phys. Lett. 87, 241105 (2005).