High contrast chiral nematic liquid crystal device using negative dielectric material

Su Seok Choi; Castles, Flynn; Morris, Stephen M.; Coles, Harry J.
November 2009
Applied Physics Letters;11/9/2009, Vol. 95 Issue 19, p193502
Academic Journal
A liquid crystal device is demonstrated using a short-pitch (260 nm) chiral nematic with negative dielectric anisotropy. Due to dielectric coupling, an in-plane electric field switches the liquid crystal between the standing-helix (field-off, “dark” state) and lying-helix (field-on, transmissive state) configurations. We report experimental results on the optical transmission as a function of the applied field, the response time (as short as 35 microseconds) and the contrast ratio (1000:1).


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