The Ultrastructure Synthesis and Nonlinear Spectroscopy of Photonic Materials

利用新发展的飞秒和皮秒非线性光谱学技术（包括相位失配光谱学）来定义由光激发激活的电子和核动力过程对pi-电子材料光学非线性的贡献。该信息用于优化这些新合成的pi-电子发色团制造的器件的性能（并定义操作限制）。埋藏通道非线性光波导是通过光化学加工和反应离子刻蚀等多种技术在这些聚合物中制备的。针对窄维电光调制器波导与大维光纤的耦合问题，提出了一种新的多色光刻技术。通过系统优化发色团的超极化率、聚合物晶格中的发色团数密度、发色团的有序度和最终聚合物晶格的玻璃化转变温度，预计电光系数超过50 pm/V且在125摄氏度以上的温度下具有长期热稳定性的聚合物材料可以制备并加工成适当的集成聚合物/半导体光子/电子器件。这种材料将比目前可用的低频调制应用材料取得重大进展。＊＊＊

9528021 Dalton Newly developed techniques of femtosecond and picosecond nonlinear optical spectrosocopy (including phase-mismatch spectroscopy) are used to define the contributions made to the optical nonlinearity of pi-electron materials by electronic and nuclear dynamical processes activated by photoexcitation. This information is used to optimize the performance (and define the operational limitations) of devices fabricated from these newly synthesized pi-electron chromophores. Buried channel nonlinear optical waveguides are fabricated in these polymers by a variety of of techniques including photochemical processing and reactive ion etching. A novel multi-color photolithography technique is proposed to solve problems of coupling narrow dimension electro-optic modulator waveguides to larger dimension fiber optic cables. %%% By systematically optimizing chromophore hyperpolarizability, chromophore number density in the polymer lattice, chromophore ordering, and the glass transition temperature of the final polymer lattice, it is anticipated by polymeric materials exhibiting electro-optic coefficients in excess of 50 pm/V and characterized by long term thermal stabilities at temperatures in excess of 125 degrees celsius can be prepared and processed into appropriate integrated polymer/semiconductor photonic/electronic devices. Such materials would represent a significant advance over currently available materials for low frequency modulation applications. ***