Sign inversion of the optical torque on the nematic director enhanced by anthraquinone dye dopants stable to the light action

By analyzing the total and on‐axis transmittance of the laser beam we studied the enhanced light‐induced director reorientation (Jánossy effect) in a nematic liquid crystal doped with anthraquinone dye molecules that do not have photoinduced conformational transformations. The obtained dependence on...

Full description

Saved in:
Bibliographic Details
Published in:Laser physics letters 2006-11, Vol.3 (11), p.531-535
Main Authors: Gayvoronsky, V. Ya, Yakunin, S. V., Pergamenshchik, V. M., Nazarenko, V. G.
Format: Article
Language:English
Subjects:
dye-doped liquid crystal
Jánossy effect
nonlinear optics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:By analyzing the total and on‐axis transmittance of the laser beam we studied the enhanced light‐induced director reorientation (Jánossy effect) in a nematic liquid crystal doped with anthraquinone dye molecules that do not have photoinduced conformational transformations. The obtained dependence on the angle between the light polarization E and the initial director n0 shows: first order director reorientation (DR) transition with hysteresis for E ⟂ n0; second order reversible DR transition with the extremely low threshold intensity for E ∥ n0; sign inversion of the nonlinear refractive index and DR in the intermediate geometry. The data suggest a presence of two different kinds of dipoles in the system: those absorbing light and those giving rise to the nonlinear refractive index. (© 2006 by Astro, Ltd. Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA)
ISSN:1612-2011
1612-202X
DOI:10.1002/lapl.200610049