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Materials 2014, 7(5), 3677-3698; doi:10.3390/ma7053677
Article

Optical Properties of Electrically Tunable Two-Dimensional Photonic Lattice Structures Formed in a Holographic Polymer-Dispersed Liquid Crystal Film: Analysis and Experiment

,
 and
*
Department of Engineering Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan
A part of this work was published as a conference proceedings paper: Ohira, R.; Miki, M.; Tomita, Y. Electrical tuning of two-dimensional honeycomb photonic lattices using holographic polymer-dispersed liquid crystals. Proc. SPIE 2010, 7618, 761813-1–761813-10.
* Author to whom correspondence should be addressed.
Received: 11 March 2014 / Revised: 7 April 2014 / Accepted: 21 April 2014 / Published: 7 May 2014
(This article belongs to the Special Issue Liquid Crystals)
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Abstract

We report on theoretical and experimental investigations of optical wave propagations in two-dimensional photonic lattice structures formed in a holographic polymer-dispersed liquid crystal (HPDLC) film. In the theoretical analysis we employed the 2×2 matrix formulation and the statistical thermodynamics model to analyze the formation of anisotropic photonic lattice structures by holographic polymerization. The influence of multiple reflections inside an HPDLC film on the formed refractive index distribution was taken into account in the analysis. In the experiment we fabricated two-dimensional photonic lattice structures in an HPDLC film under three-beam interference holographic polymerization and performed optical measurements of spectral transmittances and wavelength dispersion. We also demonstrated the electrical control capability of the fabricated photonic lattice structure and its dependence on incident wave polarization. These measured results were compared with the calculated ones by means of photonic band and beam propagation calculations.
Keywords: photonic crystal; holographic polymer-dispersed liquid crystal; photopolymer; liquid crystal; holographic polymerization photonic crystal; holographic polymer-dispersed liquid crystal; photopolymer; liquid crystal; holographic polymerization
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Miki, M.; Ohira, R.; Tomita, Y. Optical Properties of Electrically Tunable Two-Dimensional Photonic Lattice Structures Formed in a Holographic Polymer-Dispersed Liquid Crystal Film: Analysis and Experiment. Materials 2014, 7, 3677-3698.

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