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Asymmetric resonant optical torque in azo-dye-doped liquid crystals

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3 Author(s)
Galstian, Tigran V. ; Dept. de Phys., Laval Univ., Que., Canada ; Saad, B. ; Denariez-Roberge, M.M.

The photoexcitation of dichroic azo dyes creates a torque that results in a complex rotational motion of the host molecules in liquid crystal. This phenomenon has asymmetric resonant character. Efficient dynamic holograms are formed on reorientation gratings in the steady-state excitation regime. Orientational order modulation and three-dimensional molecular reorientation are detected in the transient regime of excitation. The complex coupling of photoisomerizing dye with nematic host is the origin of the observed phenomena

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Quantum Electronics, IEEE Journal of  (Volume:34 ,  Issue: 5 )