Title :
Asymmetric resonant optical torque in azo-dye-doped liquid crystals
Author :
Galstian, Tigran V. ; Saad, Bendaoud ; Denariez-Roberge, Marguerite-Marie
Author_Institution :
Dept. de Phys., Laval Univ., Que., Canada
fDate :
5/1/1998 12:00:00 AM
Abstract :
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
Keywords :
holographic gratings; liquid crystal devices; nematic liquid crystals; optical materials; optical rotation; organic compounds; photoexcitation; polarimetry; asymmetric resonant character; asymmetric resonant optical torque; azo-dye-doped liquid crystals; complex rotational motion; dichroic azo dye photoexcitation; dynamic holograms; host molecules; nematic host; orientational order modulation; photoisomerizing dye; reorientation gratings; steady-state excitation regime; three-dimensional molecular reorientation; transient regime; Gratings; Holographic optical components; Holography; Laser beams; Liquid crystals; Optical refraction; Optical variables control; Resonance; Steady-state; Torque;
Journal_Title :
Quantum Electronics, IEEE Journal of
