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Direct evidence of the molecular switching in electrically commanded surfaces for liquid crystal displays

Miha Škarabot ; Igor Muševič ; Bertil Helgee (Institutionen för kemi- och bioteknik, Polymerteknologi ; Institutionen för fysik (GU)) ; Lachezar Komitov
J.Appl.Phys. (0021-8979). Vol. 98 (2005), p. 046109.
[Artikel, refereegranskad vetenskaplig]

This work, performed by means of time-resolved high-resolution birefringence measurements, establishes the switching mechanism of electrically commanded surfaces _ECS_ for liquid-crystal displays. A distinct polar electro-optic response, due to the field-induced in-plane switching of the molecules of the 200-nm ferroelectric liquid crystalline polysiloxane alignment layer representing ECS, was detected in a cell filled with isotropic liquid _hexadecane_. The similarity between this response and the one reported recently in cells containing the same ECS but with a nematic liquid-crystal bulk with negative dielectric anisotropy (Delta-epsilon < 0) and field-free planar alignment provides direct and unambiguous proof that the switching in these cells is indeed mediated by the ECS. © 2005 American Institute of Physics. _DOI: 10.1063/1.2009071_

Nyckelord: nematic liquid crystals, ferroelectric liquid crystals, liquid crystal polymers, polymer films, molecular reorientation, molecular orientation, time resolved spectra, birefringence, electro-optical effects, permittivity, ferroelectric switching



Denna post skapades 2007-11-07.
CPL Pubid: 61315

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Polymerteknologi (2005-2014)
Institutionen för fysik (GU) (GU)

Ämnesområden

Optik
Optisk fysik
Den kondenserade materiens fysik
Ytor och mellanytor
Ytbehandlingsteknik
Funktionella material
Materialfysik med ytfysik

Chalmers infrastruktur