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Sign Inversion of the Optical Torque on the Nematic Director Enhanced by Anthraquinone Dye Dopants Stable to the Light Action by V. Ya. Gayvoronsky; S. V. Yakunin; V. M. Pergamenshchik; V. G. Nazarenko is a Physics and Astronomy article available to read on EtoBox.

What is Sign Inversion of the Optical Torque on the Nematic Director Enhanced by Anthraquinone Dye Dopants Stable to the Light Action about?

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 **n** ~0~ shows: first order director reorientation (DR) transition with hysteresis for **E** ⊥ **n** ~0~; second order reversible DR transition with the extremely low threshold intensity for **E** || **n** ~0~; 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.

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Author

V. Ya. Gayvoronsky; S. V. Yakunin; V. M. Pergamenshchik; V. G. Nazarenko

Publisher

John Wiley and Sons; IOP Publishing; Institute of Physics Publishing (IOP); Astro, Ltd. (ISSN 1612-2011)

Published

2006

Language

EN

Field

Physics and Astronomy (Physical Sciences)