Direct measurement of surface-induced orientational order parameter profile above the nematic-isotropic phase transition temperature.

Lee, Ji-Hoon.

Atherton, Timothy J.

Barna, Valentin.

De Luca, Antonio.

Bruno, Emanuela.

Petschek, Rolfe G.

Rosenblatt, Charles.


  • The spatial and temperature dependence of the surface-induced orientational order parameter S(z,T) was determined in the isotropic phase. An optical fiber was immersed in a thin liquid crystal layer and the retardation was measured as a function of the fiber's height above the surface, from which the model-independent S(z,T) was deduced with resolution ≲2  nm. It was found that (i) S(z=0)≲0.12 ... read more
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