Locally-induced permanent birefringence by polymer-stabilization of liquid crystal in cells and photonic crystal fibers |
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Authors: | M.S. Chychłowski S. Ertman K. Rutkowska O. Strzeżysz R. Dąbrowski T.R. Woliński |
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Affiliation: | 1. Faculty of Physics, Warsaw University of Technology, Koszykowa 75, Warsaw, Poland;2. Faculty of Advanced Technologies and Chemistry, Military University of Technology, Gen. Sylwestra Kaliskiego 2, Warsaw, Poland |
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Abstract: | The aim of this work was to induce permanent birefringence both in typical liquid crystal cells and photonic crystal fibers (PCFs) by photo-polymerization. For this purpose three different liquid crystalline materials, namely E7, 5CB, and 6CHBT were combined with a mixture of RM257 monomer and a UV sensitive initiator with the percentage weight less than 10%. Due to the photo-polymerization process it was possible to achieve polymer-stabilized liquid crystal orientation inside LC cells and micro-sized cylindrical glass tubes. In particular, periodic change in spatial molecular orientation was achieved by selective photo-polymerization. Successful results obtained in these simple geometries allowed for the experimental procedure to be repeated in PCFs leading to locally-induced permanent birefringence in PCFs. |
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Keywords: | Fiber optics Photonic crystal fibers Liquid crystals Polymers Birefringence Ultraviolet |
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