Asymmetric switching in a ferrielectric liquid crystal device

Jaradat, S.; Brimicombe, P. D.; Roberts, N. W.; Southern, C.; Gleeson, H. F.
October 2008
Applied Physics Letters;10/13/2008, Vol. 93 Issue 15, p153506
Academic Journal
The fast multistate switching associated with ferroelectric and antiferroelectric smectic liquid crystals makes them important materials for electro-optic devices, and asymmetric electro-optic responses are of particular interest for some analog switching applications. We report intrinsic asymmetric switching in a ferrielectric liquid crystal device observed using time-resolved small angle x-ray scattering and electro-optic measurements. The experiments reveal a marked variation in the response time depending on field polarity not present in the ferroelectric or antiferroelectric phase. We suggest that this is a consequence of the ferrielectric structure itself and interactions with the device surfaces.


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