Beam-Wave Phenomena and Interactions with Planar Configurations

该研究计划将研究由层状或周期性边界散射的光束所引起的一般电磁问题，特别关注最近才被认识到的几种特殊效应，即：出乎意料的大的横向、焦点和角位移，以及束腰的修改和强度分布的扭曲。当入射场将能量耦合到由散射结构引导的波时，这些非镜面反射现象最为明显。因此，将详细探讨波束和导波之间的相互作用，一种原始的方法被用来根据散射结构的特征(表面、泄漏等)来检查散射结构的色散特性。模式。然后将讨论具体的相关问题，例如：非镜面反射效果的影响，以及增强这些效果的程序。这一结果与涉及严格限制束场的控制和操纵的工程领域特别相关，在集成光学、超声波和微波声学中具有潜在的应用。

The research program will investigate the general electromagnetic problems posed by beams scattered by stratified or periodic boundaries, with special attention to several peculiar effects that have only recently been recognized, namely: unexpectedly large lateral, focal and angular beam shifts, as well as modifications of the beam waist and distortions of its intensity profile. These non- specular phenomena are most pronounced when the incident fields couple energy to waves guided by the scattering structure. The interactions between beams and guided waves will therefore be explored in detail, an original approach being used to examine the dispersive properties of the scattering configuration in terms of its characteristic (surface, leaky, etc.) modes. Specific pertinent questions will then be addressed, such as: the effect of the non-specular effects, and procedures to enhance those effects. The results are particularly relevant to engineering areas involving the control and manipulation of well confined beam fields, with potential applications in integrated optics, ultrasonics and microwave acoutics.