Dynamic polarization grating based on a dye-doped liquid crystal controllable by a single beam in a homeotropic-planar geometry
| Autor: | Hak-Rin Kim, Sin-Doo Lee, Jiyoon Kim, Eunje Jang, Kyung-Il Joo |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
business.industry Homeotropic alignment Physics::Optics Grating Polarization (waves) Atomic and Molecular Physics and Optics law.invention Rubbing Condensed Matter::Soft Condensed Matter Optics law Liquid crystal Radial polarization Physics::Chemical Physics Electrical and Electronic Engineering business Engineering (miscellaneous) Diffraction grating Beam splitter |
| Zdroj: | Applied optics. 51(36) |
| ISSN: | 1539-4522 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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