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Inne
Photo-induced birefringence in a nematic liquid crystal mixture doped with light-switchable mesogenic azobenzene derivatives.
Autorzy
Rok wydania
2012
Czasopismo
Numer woluminu
168
Strony
21-27
DOI
10.1016/j.molliq.2012.02.002
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
We report on photoinduced effects observed in azo-mesogene doped nematic liquid crystal mixture using birefringence measurement method. In Optical Kerr Effect configuration the photoinduced birefringence observed in the studied planarly aligned liquid crystal cell is equivalent to very high n2 ≈ 13 cm2/W nonlinear optical coefficient. Experimental results are explained on a basis of light-induced modification of the surface conditions due to trans-cis isomerizations that affect the bulk effective electric field acting on molecules. The measurements are supported by a simple model of the phenomenon and Jones matrix calculus. The response of the system is composed of two dynamically different contributions: the fast and the slow one.
Słowa kluczowe
Light-induced molecular reorientation, Optical Kerr effect, Nematic liquid crystal cell, Order parameter, Surface induced nonlinear effect
Adres publiczny
https://doi.org/10.1016/j.molliq.2012.02.002
Strona internetowa wydawcy
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