Optical properties of light-sensitive liquid- crystal elastomers in the vicinity of the nematic-paranematic phase transition (CROSBI ID 209728)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Gregorc, Marko ; Li, Hui ; Domenici, Valentina ; Ambrožić, Gabriela ; Čopič, Martin ; Drevenšek Olenik, Irena
engleski
Optical properties of light-sensitive liquid- crystal elastomers in the vicinity of the nematic-paranematic phase transition
We investigate light-induced patterning of a monodomain side-chain liquid crystal elastomer (SC-LCE) doped with light-sensitive azobenzene moiety in the temperature region close to the nematic-paranematic phase transition. We show that a strongly nonlinear relationship between the concentration of the cis isomers of the azomesogens and the refractive index modification of the material, which is characteristic for the phase transition region, results in nonmonotonous time dependence of the diffraction efficiency of a probe beam. From this effect we determine the sensitivity of the nematic transition temperature on the molar fraction of the cis isomers. The relation between the cis isomer molar fraction and nematic order also provides a possibility for recording hidden holograms, which can be made visible by cooling the sample from the paranematic to the nematic phase.
azobenzene moiety; azomesogens; cis isomers; light-induced; liquid crystal elastomers; molar fractions; monodomains; nematic order; nematic phase; probe beam; refractive-index modification; side-chains; strongly nonlinear; temperature regions; time dependence; transition regions
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Podaci o izdanju
87 (2)
2013.
022507-1-022507-7
objavljeno
1539-3755
10.1103/PhysRevE.87.022507