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Dye-doped photorefractive liquid crystals for dynamic and storage holographic grating formation and spatial light modulation

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9 Author(s)
Choon Khoo, Iam ; Dept. of Electr. Eng., Pennsylvania State Univ., University Park, PA, USA ; Min-Yi Shih ; Wood, M.V. ; Guenther, B.D.
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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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Proceedings of the IEEE  (Volume:87 ,  Issue: 11 )