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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 18 — Aug. 31, 2009
  • pp: 15926–15931

Measurement of helical twisting power based on axially symmetrical photo-aligned dye-doped liquid crystal film

Shih-Wei Ko, Shu-Hao Huang, Andy Y.-G. Fuh, and Tsung-Hsien Lin  »View Author Affiliations

Optics Express, Vol. 17, Issue 18, pp. 15926-15931 (2009)

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This investigation demonstrates a simple but accurate method for measuring the helical twisting power of chiral doped liquid crystals using axially symmetrical photo-alignment in azo dye-doped liquid crystal films. As reported in our previous paper, a reversed twist effect produces a disclination line in photo-aligned axially symmetrical liquid crystal films. The pitch and helical twisting power can be obtained by measuring the rotation angle of the disclination line in chrial doped liquid crystal. This method is independent of cell gap and provide an error below 0.5%.

© 2009 OSA

OCIS Codes
(160.3710) Materials : Liquid crystals
(220.1140) Optical design and fabrication : Alignment

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: June 29, 2009
Revised Manuscript: August 11, 2009
Manuscript Accepted: August 16, 2009
Published: August 24, 2009

Shih-Wei Ko, Shu-Hao Huang, Andy Y.-G. Fuh, and Tsung-Hsien Lin, "Measurement of helical twisting power based on axially symmetrical photo-aligned dye-doped liquid crystal film," Opt. Express 17, 15926-15931 (2009)

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