Comparison of homogeneously- and hybrid-aligned liquid crystal microlenses optical properties

Abstract

Optical properties of homogeneously-and hibrid-aligned liquid crystal (LC) microlenses with positive dielectric anisotropy have been researched. Focal lengthvoltage dependencies are similar for both types of LC-microlens. When voltage is low the microlenses possess focusing optical properties. The focal distance decreases with voltage increasing then becomes minimal and increases. At higher voltage defocusing optical properties are observed. The microlens focal distance decreases approximating asimptotically to certain value. The numerical aperture decreases with microlens diameter increasing and it is smaller at hibrid-aligned LC-microlens comared to homogeneously-aligned one The results of experiments agree qualitatively with the results of [l-31.

Variable Focal Length Lens Based on Polymer-Stabilized Nematic Liquid Crystals

“…In order to create lens-like distribution of the refractive index in the flat layer of nematic liquid crystal (NLC) a spatially distributed electric field is usually used to induce suitable configuration of the nematic director [1][2][3][4][5][6]. Surface relief microlenses may be also immersed in the standard NLC-cell [7].…”