title: Dynamic polarization grating based on a dye-doped liquid crystal controllable by a single beam in a homeotropic-planar geometry.
abstract: We present a dynamic polarization grating based on a dye-doped liquid crystal cell that is controllable by a single pump beam in a binary homeotropic-planar configuration produced through selective rubbing. Upon single pump beam irradiation, the azo dyes in the liquid-crystal (LC) layer diffuse and adsorb onto the planar LC-anchoring surface due to trans-cis photo-isomerization. It is found that the dynamic polarization grating effect results mainly from the photo-induced easy axis reorientation by the amount of dye molecules adsorbed on the planar LC-alignment surface in a single-beam control scheme. The initial LC-anchoring conditions and the dynamic behavior of the dye adsorption strongly influence the repetitive writing-erasing processes by the single pump beam.
authors.affiliation: School of Electronics Engineering, Kyungpook National University, Daegu, South Korea. rineey@ee.knu.ac.kr
authors.forename: Hak-Rin
authors.initials: HR
authors.lastname: Kim
authors.forename: Eunje
authors.initials: E
authors.lastname: Jang
authors.forename: Jiyoon
authors.initials: J
authors.lastname: Kim
authors.forename: Kyung-Il
authors.initials: KI
authors.lastname: Joo
authors.forename: Sin-Doo
authors.initials: SD
authors.lastname: Lee