Nonlinear Optical Properties of Small Grain Composites (Joint Research Effort)

三年非线性光学理论研究计划 贵金属颗粒（金、银和铜）和半导体 颗粒（Cd SexS 1-x）嵌入玻璃中或悬浮在胶体中 提出了解决方案。 研究还将关注规模 分散、形状变化和颗粒上的聚合物涂层 以增强光学非线性。 该项目涉及的理论制定的动态 这些晶粒中量子限制载流子的性质以及 介电函数的计算。 将发展一种广义有效介质理论， 复合材料的总体介电响应包括 金属或半导体颗粒和介电基质材料。 广义有效介质理论将通过数值计算得到验证 复合介质的模拟。 由此产生的介电函数将用于研究空间 电磁波在介质中的传播。 我们的描述 将包括横向模式和前向波和后向波 传播以获得材料的真实分析。 的 研究人员将研究吸收和反射的 电磁波，以及多波混频。 实验 这些材料的数据将根据这些介电常数进行分析。 功能协调发展的 光学双稳现象与光学相位共轭 也将在复合材料中进行研究。 这个项目是 预计将导致对这些应用的现实评估 非线性光学器件材料。

A three year theoretical program to study nonlinear optical properites of nobel metal grains (gold, silver and copper) and semiconductor grains (Cd SexS1-x) embedded in glasses or suspended in colloidal solutions is proposed. The research will also focus on size dispersion, shape variations and polymeric coatings on the particles to enhance the optical nonlinearities. The project involves the theoretical formulation of the dynamic properties of quantum confined carriers in these grains and the calculation of the dielectric function. A generalized effective medium theory will be developed to obtain the overall dielectric response of the composite material which includes the metal or semiconductor grains and the dielectric host material. The generalized effective medium theory will be tested by numerical simulation of the composite medium. The resultant dielectric functions will be used to study the spatial propagation of electromagnetic waves in the medium. Our description will include transverse modes and forward- and backward-wave propagation to obtain realistic analysis of the materials. The investigators will study absorption and reflection of the electromagnetic waves, as well as, multiwave mixing. Experimental data on these materials will be analyzed in terms of these dielectric functions. The phenomena of optical bistability and optical phase conjugation will also be investigated in the composite materials. This project is expected to lead to a realistic assessment of the application of these materials for nonlinear optical devices.