A newly observed dislocation network in 'Blue' Phase II of cholesteric liquid crystals.

We have observed a dislocation lattice in "Blue" Phase II of cholesteric liquid crystals. The lattice appears when using substrates that have been aligned by a rubbed surfactant (e. g. PVA or polyimide). The data indicate that the dislocation lattice is an interface of edge dislocations caused by a mismatch of the lattice parameter of "Blue" Phase II due to temperature gradients in the sample. Experimental setup and results are presented.