Micropatterning of light-sensitive liquid-crystal elastomers (CROSBI ID 228331)
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Podaci o odgovornosti
Devetak, Miha ; Zupančić, Blaž ; Lebar, Andrija ; Umek, Polona ; Zalar, Boštjan ; Domenici, Valentina ; Ambrožić, Gabriela ; Žigon, Majda ; Čopič, Martin ; Drevenšek-Olenik, Irena
engleski
Micropatterning of light-sensitive liquid-crystal elastomers
We demonstrate that photoisomerizable liquid-crystal elastomer soft films can be used as tunable holographic gratings. Optomechanical mechanism of imprinting one-dimensional grating structure into the soft matrix by two-beam uv laser interference can be clearly resolved from the time dependence of the reading beam diffraction patterns. We analyze the observed response in terms of cis-trans isomerization-controlled modulation of the grating profile. The grating period can be tuned reversibly by stretching or contraction of the specimen, either thermomechanically or by applying external stress. Temperature-induced modifications of the grating parameters in the vicinity of the nematic-paranematic phase transition are also examined.
elastomers ; holographic gratings ; isomerisation ; liquid crystal phase transformations ; nematic liquid crystals ; photochemistry ; thin films
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Podaci o izdanju
80 (5)
2009.
050701-1-050701-4
objavljeno
1539-3755
10.1103/PhysRevE.80.050701