Wave Propagation, Localization and Imaging in Random Structures

这个凝聚态物理项目涉及随机结构中波传播的理论和补充微波和光学研究。利用电磁传播与电子电导之间的类比，探索介观物理的本质。将研究和表征局部场和全局量中的统计分布和相关性，例如半透明、扩散和局部化样品中的透过率和电导率。在充满随机散射体的周期性金属网络中，通过改变散射介质及其长度和直径以及通过迁移率边缘调谐来改变无量纲电导。在透射场的相位统计中揭示了波动力学的普遍方面。声光成像的可能性使用漫反射光，激光在随机系统中的性质和应用将被研究。经典波传播是我们探测环境和彼此交流的手段。该提案探索了具有统计等价性无序的样本集合中光和微波传播的基本统计。它将建立局域场的统计与总辐射和光导之间的联系。这将增进我们对波的传播和传输和电导的巨大波动的理解，这些波动发生在从波可以传播到传输被抑制的情况的转变中。因此，它是微电路中电子传输的有用模型，微电路在现代电子学中越来越重要。使用漫反射光作为一种非侵入性乳房X光成像方式的可能性将被研究。此外，还将探讨激光在随机系统中的特性和应用。***

w:\awards\awards96\*.doc 9632789 Genack This condensed matter physics project involves theoretical and complementary microwave and optical investigations of wave propagation in random structures. The essentials of mesoscopic physics are explored by exploiting the analogy between electromagnetic propagation and electronic conductance. Statistical distributions and correlations in the local field and in global quantities such as the transmission and conductance in translucent, diffusing and localizing samples will be studied and characterized. The dimensionless conductance is changed by varying the scattering medium and its length and diameter and by tuning through the mobility edge in periodic metallic networks filled with random mixture of scatterers. Universal aspects of wave dynamic are revealed in the statistics of the phase of the transmitted field. The possibilities of acousto-optic imaging use diffuse light and the nature and applications of lasing in random systems will be investigates. %%% Classical wave propagation is the means by which we probe our environment and communicate with one another. The proposal explores the fundamental statistic of light and microwave propagation in collections of samples with statiscally equivalent disorder. It will establish the connection between the statistics of the local fields and the total transmitt3ed radiation and the optic conductance. This will improve our understanding of wave propagation and of giant fluctuation in transmission and conductance which occur in the transition from a situation in which waves can propagate to one in which transport is inhibited. It is thus a useful model of electronic transport in microcircuit which are of increasing importance in modern electronics. The possibilities of acousto-optic imaging using diffuse light as a noninvasive mammography modality will be investigated. The characteristics and applications of lasing in random systems will also be explored. ***