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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 14 — Jul. 4, 2011
  • pp: 13118–13125

Biphotonic-induced reorientation inversion in azo-dye-doped liquid crystal films

Hui-Chi Lin, Chia-Wei Chu, Ming-Shian Li, and Andy Ying-Guey Fuh  »View Author Affiliations

Optics Express, Vol. 19, Issue 14, pp. 13118-13125 (2011)

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The reorientation inversion of liquid crystal molecules in azo-dye-doped liquid crystal (ADDLC) films irradiated by biphotonic (green and red light) lasers is studied using the self-phase-modulation method. The results show that the induced change of refractive index (∆n) in an ADDLC cell illuminated with a fixed intensity of green light increases with the red-light intensity. Notably, the value of ∆n is initially negative, and becomes positive when the intensity of the red laser is increasing. It is due to the fact that an extra positive torque is exerted on the LCs, which is produced by cis-isomers upon absorbing red light to compensate the negative torque induced by the excitation of the green light.

© 2011 OSA

OCIS Codes
(160.3710) Materials : Liquid crystals
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials

ToC Category:

Original Manuscript: April 8, 2011
Revised Manuscript: June 7, 2011
Manuscript Accepted: June 12, 2011
Published: June 22, 2011

Hui-Chi Lin, Chia-Wei Chu, Ming-Shian Li, and Andy Ying-Guey Fuh, "Biphotonic-induced reorientation inversion in azo-dye-doped liquid crystal films," Opt. Express 19, 13118-13125 (2011)

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