The effects of light-induced reorientation on a homeotropical dye-doped liquid crystal (DDLC) cell are discussed. The photoexcited azo dye Methyl Red (MR) is diffused and adsorbed onto the substrate, thus forming a ripple structure. The adsorbed dye and the laser-induced ripple structure then reorient the liquid-crystal molecules and induce a holographic grating. Initially, the liquid-crystal directors are reoriented primarily by the adsorbed dye. However, given a sufficiently large ripple groove amplitude, the torque imposed by the ripple grooves overcomes that which is due to the adsorbed dyes, and the liquid crystals are realigned along the groove direction.
© 2003 Optical Society of America
(050.0050) Diffraction and gratings : Diffraction and gratings
(090.0090) Holography : Holography
(210.0210) Optical data storage : Optical data storage
(240.0240) Optics at surfaces : Optics at surfaces
Andy Y.-G. Fuh, C.-C. Liao, K.-C. Hsu, and C.-L. Lu, "Laser-induced reorientation effect and ripple structure in dye-doped liquid-crystal films," Opt. Lett. 28, 1179-1181 (2003)