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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 24 — Nov. 27, 2006
  • pp: 11709–11714

The dynamic influence of photoisomerization on optical reorientation in absorbing isotropic liquid crystals

Xiu Liu, Pei Yang, Liyong Ji, Liying Liu, and Lei Xu  »View Author Affiliations

Optics Express, Vol. 14, Issue 24, pp. 11709-11714 (2006)

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The induced transient dichroism and the transient optical Kerr effect (OKE) response of azo-doped isotropic liquid crystals were studied in picosecond time scale. Photoisomerization occurs when the azo-dye molecules are resonantly excited. As a result, a significant enhancement of OKE signal was found in the dye doped liquid crystals with respect to the pure liquid crystals. The enhancement was attributed to the extra torque exerted on liquid crystals after anisotropic orientational distribution of trans and cis isomers were generated. A modified mean field theory model was applied to treat the interactions of trans and cis isomers with liquid crystals. A small-pump enhancement factor of 3.8 was obtained, which is comparable with that of the well-known anthraquinone dye doped LC system.

© 2006 Optical Society of America

OCIS Codes
(160.3710) Materials : Liquid crystals
(190.3270) Nonlinear optics : Kerr effect
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials
(320.7100) Ultrafast optics : Ultrafast measurements

ToC Category:

Original Manuscript: September 18, 2006
Revised Manuscript: November 6, 2006
Manuscript Accepted: November 8, 2006
Published: November 27, 2006

Xiu Liu, Pei Yang, Liyong Ji, Liying Liu, and Lei Xu, "The dynamic influence of photoisomerization on optical reorientation in absorbing isotropic liquid crystals," Opt. Express 14, 11709-11714 (2006)

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