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Light-induced orientation of the molecules of nematic liquid crystals doped with comb-shaped polymers with different spatial distributions of chromophores |
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| Authors: | I A Budagovsky A S Zolot’ko T E Koval’skaya M P Smayev S A Shvetsov N I Boiko M A Bugakov M I Barnik |
| Institution: | 1. Lebedev Physical Institute, Russian Academy of Sciences, Leninskii pr. 53, Moscow, 119991, Russia 2. Moscow Institute of Physics and Technology, Institutskii per. 9, Dolgoprudnyi, Moscow Oblast, 141700, Russia 3. Moscow State University, Moscow, 119991, Russia 4. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russia |
| Abstract: | The orienting effect of light on nematic liquid crystals (NLCs) doped with comb-shaped polymers with different spatial distributions of side absorbing azobenzene fragments, i.e., a homopolymer (containing only azofragments), a block copolymer (containing additionally a block of non-absorbing fragments), and a statistical copolymer (containing randomly arranged absorbing and non-absorbing fragments) is experimentally studied. The light-induced Freedericksz transition threshold for the block copolymer is two times lower than that for the homopolymer. For NLC with statistical copolymer dopant, the first-order orientation transition with an extremely wide optical bistability region is observed. |
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