Dye-doped photorefractive liquid crystals for dynamic and storageholographic grating formation and spatial light modulation |
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| Authors: | Iam Choon Khoo Min-Yi Shih Wood M.V. Guenther B.D. Pao Hsu Chen Simoni F. Slussarenko S.S. Francescangeli O. Lucchetti L. |
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| Affiliation: | Dept. of Electr. Eng., Pennsylvania State Univ., University Park, PA; |
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| Abstract: | The basic mechanisms of photo-induced space charge field formation, director axis re-orientation, and refractive index changes in fullerene C60- and dye-doped nematic liquid crystals films are presented. In particular, in aligned methyl-red-doped nematic liquid crystal film, we observe a nonlinear index change coefficient as high as 10 cm2/W, associated with purely optically induced liquid crystal director axis re-orientation. Experimental observations of dynamic and high-resolution storage holographic grating formation, two beam coupling with gain of nearly 3000 cm-1, optical limiting action at nanowatt cw laser power, and incoherent-coherent image conversion at μW/cm2 light intensity level are discussed |
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