Photoinduced two-dimensional gratings based on dye-doped cholesteric liquid crystal films

Hui Chen Yeh, Guang Hao Chen, Chia Rong Lee, Ting Shan Mo

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

This work elucidates photoinduced two-dimensional (2D) gratings in dye-doped cholesteric liquid crystal films. The helical pitch is increased by green-beam-induced trans-cis isomerization and a concomitant thermal effect. Two-dimensional gratings appear when the green beam is turned off. Grating formation results from elastic instability caused by restored strain arising from helical pitch reduction. Grating lifetime increases as green beam intensity increases and declines under irradiation with a strong red beam. Variation in grating spacing with green intensity with various pitches is also examined.

Original languageEnglish
Article number141105
JournalJournal of Chemical Physics
Volume127
Issue number14
DOIs
Publication statusPublished - 2007 Oct 18

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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