Short pitch cholesteric electro-optical device based on periodic polymer structures

Carbone, Giovanni; Salter, Patrick; Elston, Steve J.; Raynes, Peter; De Sio, Luciano; Ferjani, Sameh; Strangi, Giuseppe; Umeton, Cesare; Bartolino, Roberto
July 2009
Applied Physics Letters;7/6/2009, Vol. 95 Issue 1, p011102
Academic Journal
The helical flexoelectro-optic effect produces a submillisecond, temperature-independent in-plane rotation of the optical axis and is potentially interesting for the display industry. The main drawback is that it relies on a texture, the uniform lying helix (ULH), which is intrinsically unstable. We present a method based on the use of periodic polymeric microchannels to create highly ordered and stable ULH structures. Electro-optic measurements performed on a test device show a large contrast ratio between bright and dark states (better then 100:1), fast switching (200 μs), and large optical rotation (>30°).


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