Partially erasable photoalignment layer formed in dye-doped liquid crystal films

Andy Ying Guey Fuh, Ko Ting Cheng

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


In this study, we propose biphotonic (i.e., two-color pumping beams) erasure for partially erasing a photoalignment layer on an indium-tin-oxide (ITO)-coated glass slide resulting from adsorbed azo dye molecules doped in a liquid crystal film. The results indicate that neither of the two-color pumping beams erases the adsorbed dye layer. However, ∼75% erasure is obtained when both two-color beams are applied simultaneously for a suitable pumping period, at suitable values of intensity ratio and relative polarization. Finally, the biphotonic erasure of a twisted nematic (TN) grating fabricated using a dye-doped liquid crystal film is demonstrated.

Original languageEnglish
Pages (from-to)8778-8781
Number of pages4
JournalJapanese Journal of Applied Physics
Issue number11
StatePublished - 15 Nov 2006


  • Biphotonic erasure effect
  • Dye-doped liquid crystals
  • Methyl red


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