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Molecular Crystals and Liquid Crystals Volume 561, 2012 - Issue 1: Proceedings of the 14th International Topical Meeting: Optics of Liquid Crystals (OLC 2011): Part III of III
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Original Articles

Light Interaction with NLCs Doped with Comb-Shaped Azopolymers with Different Degrees of Polymerization

I. A. Budagovsky Lebedev Physical Institute, Leninsky pr. 53, Moscow, 119991, Russia
,
D. S. Pavlov Lebedev Physical Institute, Leninsky pr. 53, Moscow, 119991, Russia
,
S. A. Shvetsov Lebedev Physical Institute, Leninsky pr. 53, Moscow, 119991, Russia; Moscow Institute of Physics and Technology, Institutskii per. 9, Dolgoprudny, Moscow Region, 141700, Russia
,
M. P. Smayev Lebedev Physical Institute, Leninsky pr. 53, Moscow, 119991, Russia
,
A. S. Zolot’ko Lebedev Physical Institute, Leninsky pr. 53, Moscow, 119991, Russia
,
N. I. Boiko Chemical Department, Moscow State University, Moscow, 119991, Russia
&
M. I. Barnik Shubnikov Institute of Crystallography, Leninsky pr. 59, Moscow, 119333, Russia
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Pages 89-96 | Published online: 13 Jun 2012
 
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Abstract

The light-induced director reorientation in NLCs doped with the comb-shaped azopolymers with different degrees of polymerization (the number of chromophore groups) has been studied. The negative optical nonlinearity (a decrease in the refractive index of the extraordinary wave due to the director rotation away from the light field) was observed for all dopants. It was found that the threshold power of the Freedericksz transition decreases with the polymerization degree. The light-induced Freedericksz transition of the first order was observed for the dopants with lower degrees of polymerization.

Acknowledgments

The authors are grateful to A. Yu. Bobrovsky, A. N. Lobanov, V. N. Ochkin, and V. P. Shibaev for helpful discussions.

This study was supported by the Russian Foundation for Basic Research (projects no. 11-02-01315 and 12-03-00480), LPI Educational-Scientific Complex, and the Federal Program “Scientific and Scientific-Pedagogical Personnel of Innovative Russia” (state contract no. 02.740.11.0447).

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