Liquid crystal photorefractivity - Towards supra-optical nonlinearity

I. C. Khoo, M. Y. Shih, A. Shishido, P. H. Chen, M. V. Wood

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


A review of the basic mechanisms of optically induced refractive index modification in liquid crystalline materials is presented. We describe how the use of methyl-red dye or an azobenzene liquid crystal will dramatically enhance the nonlinear optical responses of typical nematic liquid crystals (NLC). The intensity dependent refractive index changes in these materials are characterized by nonlinear coefficients of over 1cm2/W. The principal contributing mechanisms are orientational photorefractivity associated with photo-induced space charge fields, dopant-nematic molecular torque, and order parameter modification caused by trans-cis isomerization of the azo-dopants.

Original languageEnglish (US)
Pages (from-to)85-90
Number of pages6
JournalOptical Materials
Issue number1
StatePublished - Oct 2001

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Computer Science(all)
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering


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