Design, Synthesis and Characterization of Novel Nonlinear Optical Materials
Design, Synthesis and Characterization of Novel Nonlinear Optical Materials

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Published: 1996

Total Pages: 26

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The research accomplished in this project consists of four tasks each dealing with a different class of nonlinear optical (NLO) materials. Task (I): Second-order nonlinear optical materials. We developed new chromophores and processing to produce electro-optic materials with enhanced optical transparency towards the visible (>=700 nm), increased chemical and thermal stability and stability of poled alignment for 1000 hours at 100 deg C. Several approaches showed promises and we accomplished a great deal. Also, we developed polyurethane cross-linking polymers to produce thermally stable poling alignment in both molecular-ionic type and neutral type second-order chromophores. In both cases stability up to 1000 hours at 100 deg C was achieved. In another approach, in collaboration with Professor Shea of University of California, Irvine, we have employed ormosils to produce stable poled alignments. Task (II): Third-order nonlinear optical materials. We synthesized a group of phosphoylides containing a polarizable P atom and investigated their X(3) behavior via femtosecond Kerr gate measurements. By using optically heterodyned and phase-tuned Kerr gate techniques, we obtained both the signs and the magnitudes of the real and the imaginary components of X(3).

Design, Synthesis and Characterization of Novel Nonlinear Optical Polymers
Design, Synthesis and Characterization of Novel Nonlinear Optical Polymers

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Published: 1995

Total Pages: 32

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The principal focus of the project is to develop new materials chemistry based on molecular level design and solid state chemistry. The goals have been to develop electroactive polymers with novel electronic, optical and nonlinear optical properties. Second and third order nonlinear optical materials have been developed based on conjugated macromolecules and asymmetric anharmonic molecular electronic dipolar oscillators. In this multidisciplinary research effort, starting from first principle, bulk self assembly processing techniques needed to control the molecular and supermolecular organizations of optical and electroactive molecules have been developed. They include spontaneous molecular organization of nonlinear optically active conjugated polymers such as polydiacetylenes with conjugating and hydrogen bonding side groups. A series of new soluble PDAs of the same class with further functionalization, elaborating on the already defined design principle have been developed. (MM).