Photonic manipulation of topological defects in liquid-crystal emulsions doped with azobenzene derivatives

Takahiro Yamamoto*, Yuka Tabe, Hiroshi Yokoyama

*この研究の対応する著者

研究成果: Article査読

14 被引用数 (Scopus)

抄録

By modulating liquid-crystal alignment on a colloidal sphere, we successfully manipulated topological defects in glycerol-droplet/liquid-crystal emulsions doped with amphiphilic azobenzene derivatives. At an initial state, a disclination loop (Saturn ring) could be observed around the droplet, in which the azobenzene molecules should adsorb onto the droplet and liquid crystal molecules align normally to the surface of the droplet. On irradiation with ultra-violet light (λ = 365 nm), the disclination loop was unfastened and transformed into two point defects called boojums. This should be attributed to the alignment change of the liquid crystal molecules from normal to planar arrangement triggered by trans-to-cis photoisomerization of the adsorbed azo-dyes. On irradiation with visible light causing cis-to-trans photoisomerization (λ = 435 nm), the boojums went back to the Saturn ring reversibly.

本文言語English
ページ(範囲)81-84
ページ数4
ジャーナルThin Solid Films
509
1-2
DOI
出版ステータスPublished - 2006 6 19

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 表面および界面
  • 表面、皮膜および薄膜
  • 金属および合金
  • 材料化学

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