Alignment Control of a Columnar Liquid Crystal for a Uniformly Homeotropic Domain Using Circularly Polarized Infrared Irradiation

Authors

  • H. Monobe,

    1. Molecular Materials and Devices Research Group, Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
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  • K. Awazu,

    1. Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 573-0128, Japan
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  • Y. Shimizu

    1. Molecular Materials and Devices Research Group, Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
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  • We gratefully acknowledge the financial support of the Ministry of Economy, Trade and Industry (METI). This work was partly supported by an Industrial Technology Research Grant Program in 2003 from the New Energy and Industrial Technology Development Organization (NEDO) of Japan. We also thank Mr. Shoichiro Kuma for his support in operating the FEL facilities, and Dr. Hironobu Hori, Dr. Yoshihiro Setoguchi, Mr. Shuichi Shinohara, and Mr. Shuichi Okamoto for their support in preparing the materials.

Abstract

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Circularly polarized infrared irradiation of a hexagonal columnar mesophase with a free-electron laser causes the liquid crystal to change from an “edge-on” alignment to a uniformly homeotropic “face-on” alignment (see Figure) due to vibrational excitation of the aromatic C–H vibration band of triphenylene.

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