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Proceedings Paper

Fast beam steering cholesteric diffractive devices
Author(s): Oleg D. Lavrentovich; Sergey V. Shiyanovskii; Dmitry Voloschenko
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Paper Abstract

Electrically-controlled diffractive gratings are developed on the basis of cholesteric liquid crystal confined between two transparent non-patterned electrodes. The electrodes are coated with alignment layers providing either planar or homeotropic anchoring. For planar alignment the applied electric field causes reorientation of initial (zero field) planar state and creates 1D modulated structures in the plane of the cell. The modulations occur via two distinct scenarios: (1) nucleation and expansion of `stripes' and (2) undulation of quasinematic layers in the plane normal to the cell's plates. the process (2) is faster since it does not require overcoming an energy barrier. In cells with homeotropic surface alignment modulated structures exist without applied voltage. Magnetic field is used to provide uniform orientation of these structures. Confocal microscope studies and 2D computer simulations are carried out to reveal the fine structure of the diffractive gratings.

Paper Details

Date Published: 2 July 1999
PDF: 7 pages
Proc. SPIE 3787, Optical Scanning: Design and Application, (2 July 1999); doi: 10.1117/12.351639
Show Author Affiliations
Oleg D. Lavrentovich, Kent State Univ. (United States)
Sergey V. Shiyanovskii, Kent State Univ. (United States)
Dmitry Voloschenko, Kent State Univ. (United States)

Published in SPIE Proceedings Vol. 3787:
Optical Scanning: Design and Application
Leo Beiser; Stephen F. Sagan; Gerald F. Marshall, Editor(s)

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