Study on laser action from UV-curable chiral nematic liquid crystals

Seiichi Furumi, Shiyoshi Yokoyama, Akira Otomo, Shinro Mashiko

研究成果: ジャーナルへの寄稿Conference article

9 引用 (Scopus)

抄録

This paper describes the study on laser action from UV-curable chiral nematic liquid crystals (CLCs) doped with a fluorescent dye before and after photopolymerization of CLC host. When an optically active agent without crosslinkable moiety was doped in a UV-curable nematic liquid crystal, the laser action from the CLC cell was quite different before and after photopolymerization. Before the polymerization, optically pumping of dye-doped CLC cells with a linearly polarized laser beam gave rise to the laser emission with circular polarization at the band edge of CLC reflection as a consequence of the internal distributed feedback effect. Successively, photopolymerization of the CLC with 365 nm light brought about the thorough disappearance of the CLC reflection band probably due to the phase separation leading to the emergence of amplified spontaneous emission of fluorescent dye by optically pumping. In contrast, the dye-doped CLC cell including a crosslinkable agent with a cholesteryl residue enabled the mirrorless laser action after photopolymerization. This is because the selective reflection band of CLC host was retained by the planar structure of cholesteric polymer network.

元の言語英語
ページ(範囲)423-427
ページ数5
ジャーナルThin Solid Films
438-439
DOI
出版物ステータス出版済み - 8 22 2003
外部発表Yes
イベントThe 5th International Conference on Nano-Molecular Electronics - Kobe, 日本
継続期間: 12 10 200212 12 2002

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Nematic liquid crystals
liquid crystals
Lasers
Photopolymerization
lasers
Dyes
dyes
Fluorescent Dyes
pumping
Coloring Agents
cells
Circular polarization
Spontaneous emission
planar structures
circular polarization
Phase separation
spontaneous emission
Laser beams
Polymers
polymerization

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

これを引用

Study on laser action from UV-curable chiral nematic liquid crystals. / Furumi, Seiichi; Yokoyama, Shiyoshi; Otomo, Akira; Mashiko, Shinro.

:: Thin Solid Films, 巻 438-439, 22.08.2003, p. 423-427.

研究成果: ジャーナルへの寄稿Conference article

Furumi, Seiichi ; Yokoyama, Shiyoshi ; Otomo, Akira ; Mashiko, Shinro. / Study on laser action from UV-curable chiral nematic liquid crystals. :: Thin Solid Films. 2003 ; 巻 438-439. pp. 423-427.
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AB - This paper describes the study on laser action from UV-curable chiral nematic liquid crystals (CLCs) doped with a fluorescent dye before and after photopolymerization of CLC host. When an optically active agent without crosslinkable moiety was doped in a UV-curable nematic liquid crystal, the laser action from the CLC cell was quite different before and after photopolymerization. Before the polymerization, optically pumping of dye-doped CLC cells with a linearly polarized laser beam gave rise to the laser emission with circular polarization at the band edge of CLC reflection as a consequence of the internal distributed feedback effect. Successively, photopolymerization of the CLC with 365 nm light brought about the thorough disappearance of the CLC reflection band probably due to the phase separation leading to the emergence of amplified spontaneous emission of fluorescent dye by optically pumping. In contrast, the dye-doped CLC cell including a crosslinkable agent with a cholesteryl residue enabled the mirrorless laser action after photopolymerization. This is because the selective reflection band of CLC host was retained by the planar structure of cholesteric polymer network.

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