Fast beam steering cholesteric diffractive devices

Oleg D. Lavrentovich; Sergey V. Shiyanovskii; Dmitry Voloschenko

doi:10.1117/12.351639

2 July 1999 Fast beam steering cholesteric diffractive devices

Oleg D. Lavrentovich, Sergey V. Shiyanovskii, Dmitry Voloschenko

Proceedings Volume 3787, Optical Scanning: Design and Application; (1999) https://doi.org/10.1117/12.351639
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

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.

Citation Download Citation

Oleg D. Lavrentovich, Sergey V. Shiyanovskii, and Dmitry Voloschenko "Fast beam steering cholesteric diffractive devices", Proc. SPIE 3787, Optical Scanning: Design and Application, (2 July 1999); https://doi.org/10.1117/12.351639

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