Nano-level light-electdc-field control of reorientation of liquid crystalline molecules and its applications to optical information processing

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A control of a molecular orientation of polymer materials is of great interest for an optical storage, highly functionalized optical device, birefringent film etc. By the use of a linearly polarized light and interference light, refractive index change is induced in liquid crystalline media. In this study, the alignment of liquid crystalline molecules has been photo-controlled and the micron-and nano-size patterns have been generated. The principle of the research results are summarized as followed.(1)Spatial-selective reconstruction in photorefractive liquid crystal composites by means of real-time holographic technique.(2)Image inversion in dye-doped liquid crystals by means of nonlinear Fourier transformation optical system.(3)Highly efficient photorefractive effects in photorefractive liquid crystal/polymer composites.(4)All-optical focal length converter generated in dye-doped liquid crystals.(5)Polarization holographic gratings in photo-cross-linkable polymer liquid crystals and polarization conversion in the gratings.These results suggest that the light-control of the molecular reorientation is very useful for the photonics applications.