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°). © 2009 American Institute of Physics.
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. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - 95:1(2009), p. 011102. [10.1063/1.3159624]
Short pitch cholesteric electro-optical device based on periodic polymer structures
De Sio, Luciano;Bartolino, Roberto
2009
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 μs), and large optical rotation (>30°). © 2009 American Institute of Physics.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
