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Ferroelectric switching of electrically commanded alignment layers for liquid crystal displays

Artikel i vetenskaplig tidskrift
Författare I. Drevensek-Olenik
K Kunstelj
J. Koncilija
Lachezar Komitov
Publicerad i J.Appl.Phys.
Volym 100
Sidor 073514
ISSN 0021-8979
Publiceringsår 2006
Publicerad vid Institutionen för fysik (GU)
Sidor 073514
Språk en
Länkar scitation.aip.org/getpdf/servlet/Ge...
Ämnesord ferroelectric liquid crystals, ferroelectric displays, liquid crystal displays, optical harmonic generation, liquid crystal polymers, dielectric polarisation, ferroelectric switching, liquid films, electric domains, birefringence
Ämneskategorier Optik, Optisk fysik, Ytor och mellanytor, Defekter och diffusion, Struktur- och vibrationsfysik, Funktionella material, Materialfysik med ytfysik

Sammanfattning

Optical second harmonic generation (SHG) was used to probe the structural and dynamic properties of electrically commanded alignment layers for liquid crystal displays. The layers were 200 nm thick and were made of siloxane-based side chain ferroelectric liquid crystal polymer (FLCP). The effect of an external dc electric field in the range of 0–2 V/µm on the SHG signal was probed in an empty sandwich cell and in a cell filled with an isotropic liquid (hexadecane). In both cases the nonlinear induced polarization shows characteristics of the "V-shaped" switching, which is associated with a relatively minor reorientational perturbation of the film. This signifies a presence of domain structure, which is strongly pinned to the substrates. The values of switching times deduced from the SHG response are two orders of magnitude larger from the values obtained by optical birefringence measurements. This observation suggests that in the top surface layer of the FLCP, which is mainly responsible for the birefringence and also for the so-called electrically commanded surface effect, the reorientation of the polymer side chains takes place much faster than in the regions close to the substrate. ©2006 American Institute of Physics

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