The Directional Peeling Effect of Nanostructured Rigiflex Molds on Liquid-Crystal Devices: Liquid-Crystal Alignment and Optical Properties

Authors

  • Jong Bok Kim,

    1. Department of Materials Science and Engineering (BK21), Yonsei University 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749 (Korea)
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  • Ju Ri Lim,

    1. Center for Intelligent Nano-Bio Materials and Division of Nano Science (BK21), Ewha Womans University 11-1 Daehyun-dong, Seodaemun-gu, Seoul 120-750 (Korea)
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  • Jin Seol Park,

    1. Department of Electrical Engineering, Soongsil University 511 Sangdo-dong, Dongsak-gu, Seoul 156-743 (Korea)
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  • Han Jin Ahn,

    1. Department of Materials Science and Engineering (BK21), Yonsei University 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749 (Korea)
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  • Min Jung Lee,

    1. Center for Intelligent Nano-Bio Materials and Division of Nano Science (BK21), Ewha Womans University 11-1 Daehyun-dong, Seodaemun-gu, Seoul 120-750 (Korea)
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  • Sung Jin Jo,

    1. Department of Materials Science and Engineering (BK21), Yonsei University 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749 (Korea)
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  • Mihee Kim,

    1. Center for Intelligent Nano-Bio Materials and Division of Nano Science (BK21), Ewha Womans University 11-1 Daehyun-dong, Seodaemun-gu, Seoul 120-750 (Korea)
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  • Daeseung Kang,

    1. Department of Electrical Engineering, Soongsil University 511 Sangdo-dong, Dongsak-gu, Seoul 156-743 (Korea)
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  • Se Jong Lee,

    1. Department of Materials Science and Engineering, Kyungsung University 314-79 Daeyeon-dong, Nan-gu, Busan 608-736 (Korea)
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  • Youn Sang Kim,

    Corresponding author
    1. Center for Intelligent Nano-Bio Materials and Division of Nano Science (BK21), Ewha Womans University 11-1 Daehyun-dong, Seodaemun-gu, Seoul 120-750 (Korea)
    • Youn Sang Kim, Center for Intelligent Nano-Bio Materials and Division of Nano Science (BK21), Ewha Womans University 11-1 Daehyun-dong, Seodaemun-gu, Seoul 120-750 (Korea).===

      Hong Koo Baik, Department of Materials Science and Engineering (BK21), Yonsei University 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749 (Korea).===

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  • Hong Koo Baik

    Corresponding author
    1. Department of Materials Science and Engineering (BK21), Yonsei University 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749 (Korea)
    • Youn Sang Kim, Center for Intelligent Nano-Bio Materials and Division of Nano Science (BK21), Ewha Womans University 11-1 Daehyun-dong, Seodaemun-gu, Seoul 120-750 (Korea).===

      Hong Koo Baik, Department of Materials Science and Engineering (BK21), Yonsei University 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749 (Korea).===

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  • This work was equally supported by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korea government (MOST) (R01-2006-000-11066-0) and the SRC program of MOST/KOSEF through the Center for Intelligent Nano-Bio Materials at Ewha Womans University (R11-2005-008-00000-0). D. K. acknowledges Soongsil University for financial support. The authors are supported by the Brain Korea 21(BK 21) fellowship from the Ministry of Education of Korea.

Abstract

We report a new strategy, the directional peeling of a rigiflex mold with a nanostructure, to overcome several problems with general patterning techniques for liquid-crystal (LC) alignment. These include difficulty in generating the pretilt angle and in controlling the LC rising-up direction, formation of local domains, and weak optical properties. The directional peeling of the rigiflex mold results in pretilt-angle formation and controls the LC rising-up direction. In addition, a nanostructure with small spacing aligns the LC with a high order parameter because of a strong confinement effect and suppresses diffraction due to its small spacing. Eventually, the nanostructure achieves improvements in the optical properties. In summary, while recent patterning techniques for LC alignment only solve one problem, the directional peeling of the rigiflex mold with a nanostructure simultaneously overcomes several problems with LC alignment and optical properties.

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