한국정보디스플레이학회:학술대회논문집

The Korean Infomation Display Society (한국정보디스플레이학회)
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Electro-controllable omni-directional laser emissions from a helical polymeric network composite film

  • Jang, Won-Gun (Microoptics team, KOPTI) ;
  • Park, Byoung-Choo (Department of Electrophysics, Kwangwoon University) ;
  • Kim, Min-A (Department of Electrophysics, Kwangwoon University) ;
  • Kim, Sun-Woong (Department of Electrophysics, Kwangwoon University) ;
  • Kim, Yun-Ki (Department of Electrophysics, Kwangwoon University) ;
  • Choi, Eun-Ha (Department of Electrophysics, Kwangwoon University) ;
  • Seo, Yoon-Ho (Department of Electrophysics, Kwangwoon University) ;
  • Cho, Guang-Sup (Department of Electrophysics, Kwangwoon University) ;
  • Kang, Seung-Oun (Department of Electrophysics, Kwangwoon University) ;
  • Takezoe, Hideo (Department of Organic and Polymeric Materials, Tokyo Institute of Technology)
  • Published : 2008.10.13
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Abstract

In optical information technology, an electro-controllable Photonic Band Gap (PBG) in a photonic crystal (PC) material is potentially useful for the manipulation of light. Despite a great deal of research on PBGs, the reliable use of electro-active PBG material systems is restricted to only a few cases because of the complex and limiting nature of the structures involved. Here, we propose a PBG system that uses a liquid crystal (LC) polymer composite. The composite is made of nematic LCs (NLCs) embedded in polymeric helical networks of photo-polymerized cholesteric LCs (CLCs). The composite film shows a large field-induced reversible color shift over 150 nm of the reflection band, due to the reorientational undulation of the helical axis, similar to the Helfrich effect.

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