期刊
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
卷 358, 期 -, 页码 1-13出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/10587250108028266
关键词
liquid crystal; supra-optical nonlinearity; methyl red; azobenzene liquid crystal; refractive index change; image conversion; optical limiting
In nematic liquid crystal films doped with methyl-red dye or azobenzene liquid crystal, we have observed extremely efficient optically induced director axis reorientation effects, and refractive index change coefficients > > 1 cm(2)/W. The basic mechanisms involved are determined to be optically induced space charge fields and flow reorientation, order parameter modification and molecular torques by the photo-excited dopant molecules. These supra-optical nonlinearities (SONs) enable nonlinear image conversion, optical limiting and holographic grating formation with muW power lasers.
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