Minority Research Planning Grant: Precision Poling of Dye-Doped Polymers Using Ion Beam Irradiation

9706398 Ghebremichael本文将研究轻离子注入非线性光学聚合物的效应。 聚合物中的光学非线性是通过用非线性光学发色团掺杂光学非活性聚合物来实现的。 非线性光学聚合物，当第一次加工时，通常具有各向同性的体积对称性。 对于用于二阶非线性光学应用的这种聚合物，其中需要体不对称性，必须改变发色团的构型。 预期离子辐照诱导的取向顺序的取向顺序是大的，因为离子沉积深度（因此任何化学或物理反应）是高度局部化的并且由离子束能量确定。 与目前采用的技术相比，离子注入诱导有序后的弛豫时间也有望显著增加，因为这种方法实际上与温度无关。 非线性光学的研究，如二次谐波产生，电光效应，和z-扫描技术将被用来估计在散装样品和波导器件的离子辐照诱导的不对称性的程度。 此外，线性光学和机械性能的标准研究应该揭示照射对极化系统完整性的影响。 ***

9706398 Ghebremichael The effects of implantation of light ions in nonlinear optical polvmers will be studied. The optical nonlinearity in the polymers is achieved by doping the optically inactive polymers with nonlinear optical chromophores. Nonlinear optical polymers, when first processed, usually have an isotropic bulk svmmetry. For such polymers to be used in second order nonlinear optical applications, where bulk asymmetry is required, the configuration of the chromophores has to be altered. The orientational orders of the ion irradiation-induced orientational order is expected to be large because the ion deposition depth, thus any chemical or physical reaction, is highly localized and determined by the ion beam energy. The relaxation time after ion implantation induced order is also expected to significantly increase, compared with the techniques currently employed, because this method is virtually temperature independent. Nonlinear optical studies, such as second harmonic generation, electrooptic effect, and z-scan techniques will be used to estimate the degree of ion irradiation induced asymmetry in bulk samples and waveguide devices. Furthermore, standard studies of linear optical and mechanical properties should reveal the effects of the irradiation on the integrity of the poled systems. ***