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30 August 2006 InP-based planar photonic crystals infiltrated with solid polymers and liquid crystals
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The filling is reported of the air holes of an InP-based two-dimensional photonic crystal with solid polymer and with liquid crystal 5CB. The polymer filling is obtained by thermal polymerization of an infiltrated liquid monomer, trimethylolpropane triacrylate. The filling procedure for both the monomer and liquid crystal relies on the capillary action of the liquid inside the ~ 200 nm diameter and < 2.5 μm deep air holes. The solid polymer infiltration result was directly inspected by cross-sectional scanning electron microscopy. It was observed that the holes are fully filled to the bottom. The photonic crystals were optically characterized by transmission measurements around the 1.5 μm wavelength band both before and after infiltration. The observed high-frequency band edge shifts are consistent with close to 100% filling, for both the polymer and the liquid crystal. No differences were observed for filling under vacuum or ambient, indicating that the air diffuses efficiently through the liquid infiltrates, in agreement with estimates based on the capillary pressure rise.
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Rob van der Heijden D.D.S., Charlotte Kjellander, Carl-Fredrik Carlström, Juri Snijders, Harm Kicken, Cees Bastiaansen, Dick Broer, Fouad Karouta, Richard Nötzel, Emile van der Drift, and Huub Salemink "InP-based planar photonic crystals infiltrated with solid polymers and liquid crystals", Proc. SPIE 6322, Tuning the Optic Response of Photonic Bandgap Structures III, 632205 (30 August 2006);

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