Anomalous Dispersion Enhanced Nonlinear Optical Devices

9521664 Singer PI建议演示和研究反常色散优化的切伦科夫相位匹配二次谐波产生，并研究其对级联三阶非线性的影响。 波导中切伦科夫相位匹配二次谐波产生的理论表明，当与切伦科夫相位匹配耦合时，固有相位匹配导致二次谐波产生效率的大幅增强，并且最近，已经表明级联非线性中可能发生大的相移。 模拟表明，即使在不完全的本征相位匹配的效率大的增强。 切伦科夫相位匹配与适当的本征相位匹配方案的结合使用消除了关键的制造或材料特性。 反常色散已被证明是一种有效的本征相位匹配技术在有机溶液中，最近在聚合物波导。 反常色散沿着切伦科夫过程的使用还通过在包层中引导二次谐波光来克服反常色散相位匹配中的吸收效应。 我们将证明这种类型的相位匹配和研究其依赖于电场极化聚合物波导的制造和材料参数。 该结构依赖于一个极化的非线性光学层组成的聚合物掺杂与最近开发的异常色散非线性光学染料。 平板和通道波导结构将被调查。 此外，还将研究基频光的非线性相移。 反常色散可能是依赖于相位匹配特性的非线性光学相互作用的一种重要增强机制。 这将导致更有效的光子器件在光学数据存储和处理中的应用。 ***

9521664 Singer The PI proposes to demonstrate and study anomalous dispersion optimized Cerenkov phase-matched second harmonic generation and to investigate its effect on cascaded third-order nonlinearities. Theories of Cerenkov phase-matched second harmonic generation in waveguides indicate that intrinsic phase-matching when coupled with Cerenkov phase-matching leads to large enhancements in second harmonic generation efficiency, and more recently, have suggested that large phase-shifts in cascaded nonlinearities can occur. Simulations indicate large enhancements in efficiency even with incomplete intrinsic phase-matching. The use of Cerenkov phase- matching in combination with an appropriate intrinsic phase- matching scheme eliminates critical fabrication or material properties. Anomalous dispersion has been shown to be an effective intrinsic phase-matching technique in organic solutions, and recently in polymeric waveguides. The use of anomalous dispersion along with the Cerenkov process also overcomes the effect of absorption in anomalous dispersion phase-matching by guiding the second harmonic light in the cladding. We will demonstrate this type of phase matching and study its dependence on fabrication and material parameters in electric-field-poled polymeric waveguides. The structures rely on a poled nonlinear optical layer composed of a polymer doped with a recently developed anomalous dispersion nonlinear optical dye. Both slab and channel waveguide structures will be investigated. The nonlinear phase shift of the fundamental light will also be studied. Anomalous dispersion may represent an important enhancement mechanism for nonlinear optical interactions which depend on phase- matching properties. This would lead to more efficient photonic devices for application in optical data storage and processing. ***