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 mu s), and large optical rotation (>30 degrees). (C) 2009 American Institute of Physics.

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

STRANGI, Giuseppe;UMETON, Cesare Paolo;BARTOLINO, Roberto
2009-01-01

Abstract

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 mu s), and large optical rotation (>30 degrees). (C) 2009 American Institute of Physics.
2009
LIQUID-CRYSTALS, ; DIFFRACTION, ; GRATINGS
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/131124
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