24-10-2012, 11:22 AM
Periodically Aligned Liquid Crystal: Potential Application for Projection Displays
ABSTRACT
A nematic liquid crystal (NLC) layer with the anisotropy axis modulated at a fixed rate q in the transverse direction is
considered. If the layer locally constitutes a half-wave plate, then the thin-screen approximation predicts 100% -efficient
diffraction of normal incident wave. The possibility of implementing such a layer via anchoring at both surfaces of a cell with
thickness L is studied as a function of parameter qL and threshold values of this parameter are found for a variety of cases.
Distortions of the structure of director in comparison with the preferable ideal profile are found via numerical modeling.
Freedericksz transition is studied for this configuration. Coupled-mode theory is applied to light propagation through such cell
allowing to account for walk-off effects and effects of nematic distortion. In summary, this cell is suggested as a means for
projection display, high efficiency is predicted.
ABSTRACT
A nematic liquid crystal (NLC) layer with the anisotropy axis modulated at a fixed rate q in the transverse direction is
considered. If the layer locally constitutes a half-wave plate, then the thin-screen approximation predicts 100% -efficient
diffraction of normal incident wave. The possibility of implementing such a layer via anchoring at both surfaces of a cell with
thickness L is studied as a function of parameter qL and threshold values of this parameter are found for a variety of cases.
Distortions of the structure of director in comparison with the preferable ideal profile are found via numerical modeling.
Freedericksz transition is studied for this configuration. Coupled-mode theory is applied to light propagation through such cell
allowing to account for walk-off effects and effects of nematic distortion. In summary, this cell is suggested as a means for
projection display, high efficiency is predicted.