Lightwave manipulation by organic nonlinear optical materials

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As current communication systems are becoming more powerful and complex, optical technology is expected to contribute significantly to the future electronic information processing network. The objective of this research is to develop light manipulation devices such as frequency manipulation device, phase and intensity manipulation device and wavefront manipulation device.In this project, wide variety of second-order NLO materials, photorefractive materials, optical waveguide and polymer optical fibers, and novel materials consisting of chiral group were developed. Organic ionic salts possess large optical nonlinearity with relatively low cut off wavelength. Nano particles of organic crystal are prepared with negative charge and χィイD1(3)ィエD1 of nanocrystals found to be 10ィイD1-7ィエD1 esu. Efficient phase and intensity manipulation device were prepared by crystal cored fiber. In addition novel optical modulators based on chiral nonlinearity were developed. The very stable NLO polymers consisting of α-helix polypeptide were synthesized and a sub-micron χィイD1(2)ィエD1 grating structure was fabricated by self-assembly technique to achieve high conversion efficiency and high bandwidth modulation.We have developed multifunctional chromophores which enables us to obtain "monolithic photorefractive materials" The efficient photorefractive effects allow us to demonstrate imagereconstruction and optical associative memory. Optical space modulator was fabricated by using poled polymer photonic crystal.The sensitivity of this space modulation and response time were improved more than 10 times by coupling with cavity structure.