Observation of a hexagonal blue phase in systems with negative dielectric anisotropy

Abstract The occurrence of a three dimensional hexagonal blue phase BPH (possible space groups P6222 and P6422) in materials with negative dielectric anisotropy ϵa = ϵ∥ - ϵ⊊ has been detected by the investigation of Kossel diagrams. This is the first observation of a field-induced transition between different blue phase modifications for systems with ϵa 0 (four-fold axis parallel to th...